* Remove Imported injection from compass core

* Move Sprite stylesheets into sprite gem
* Updated tests

Author: scottdavis

core/stylesheets/compass/utilities/_sprites.scss renamed to sprites/stylesheets/_sprites.scss

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+@import "sprites/base";
+@import "sprites/sprite-img";

sprites/stylesheets/compass/_sprites.scss

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+// Determines those states for which you want to enable magic sprite selectors
+$sprite-selectors: hover, target, active, focus !default;
+
+// Set the width and height of an element to the original
+// dimensions of an image before it was included in the sprite.
+@mixin sprite-dimensions($map, $sprite) {
+  height: image-height(sprite-file($map, $sprite));
+  width: image-width(sprite-file($map, $sprite));
+}
+
+// Set the background position of the given sprite `$map` to display the
+// sprite of the given `$sprite` name. You can move the image relative to its
+// natural position by passing `$offset-x` and `$offset-y`.
+// The background-position will be returned in pixels. By passing `true
+// for `$use_percentages`, you get percentages instead.
+@mixin sprite-background-position($map, $sprite, $offset-x: 0, $offset-y: 0,
+$use-percentages: false) {
+  background-position: sprite-position($map, $sprite, $offset-x, $offset-y,
+  $use-percentages);
+}
+
+
+// Determines if you want to include magic selectors in your sprites
+$disable-magic-sprite-selectors: false !default;
+
+// Set this to underscore if you prefer
+$default-sprite-separator: "-" !default;
+
+// Include the position and (optionally) dimensions of this `$sprite`
+// in the given sprite `$map`. The sprite url should come from either a base
+// class or you can specify the `sprite-url` explicitly like this:
+//
+//     background: $map no-repeat;
+@mixin sprite($map, $sprite, $dimensions: false, $offset-x: 0, $offset-y: 0,
+                             $use-percentages: false,
+                             $use-magic-selectors: not $disable-magic-sprite-selectors,
+                             $separator: $default-sprite-separator) {
+  @include sprite-background-position($map, $sprite, $offset-x, $offset-y,
+                                      $use-percentages);
+  @if $dimensions {
+    @include sprite-dimensions($map, $sprite);
+  }
+  @if $use-magic-selectors {
+    @include sprite-selectors($map, $sprite, $sprite, $offset-x, $offset-y,
+                              $use-percentages, $separator);
+  }
+}
+
+// Include the selectors for the `$sprite` given the `$map` and the 
+// `$full-sprite-name`
+// @private
+@mixin sprite-selectors($map, $sprite-name, $full-sprite-name, $offset-x: 0,
+                        $offset-y: 0, $use-percentages: false,
+                        $separator: $default-sprite-separator) {
+  @each $state in $sprite-selectors {
+    $sprite-class: "#{$full-sprite-name}#{$separator}#{$state}";
+    @if sprite_has_selector($map, $sprite-name, $state) {
+      @if sprite_has_valid_selector($sprite-class) {
+        &:#{$state}, &.#{$sprite-class} {
+            @include sprite-background-position($map, sprite_selector_file($map, $sprite-name, $state),
+                                                $offset-x, $offset-y, $use-percentages);
+        }
+      }
+    }
+  }
+}
+
+// Generates a class for each space separated name in `$sprite-names`.
+// The class will be of the form .<map-name>-<sprite-name>.
+//
+// If a base class is provided, then each class will extend it.
+//
+// If `$dimensions` is `true`, the sprite dimensions will specified.
+// Positions are returned in pixel units. Set `$use_percentages` to true to
+// instead get percentages.
+@mixin sprites($map, $sprite-names, $base-class: false, $dimensions: false,
+               $prefix: sprite-map-name($map), $offset-x: 0, $offset-y: 0,
+               $use-percentages: false,
+               $separator: $default-sprite-separator) {
+  @each $sprite-name in $sprite-names {
+    @if sprite_does_not_have_parent($map, $sprite-name) {
+      $full-sprite-name: "#{$prefix}#{$separator}#{$sprite-name}";
+      @if sprite_has_valid_selector($full-sprite-name) {
+        .#{$full-sprite-name} {
+          @if $base-class { @extend #{$base-class}; }
+          @include sprite($map, $sprite-name, $dimensions, $offset-x, $offset-y, 
+                          $use-percentages, $separator: $separator);
+        }
+      }
+    }
+  }
+}

core/stylesheets/compass/utilities/sprites/_base.scss renamed to sprites/stylesheets/compass/sprites/_base.scss

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+@import "compass/typography/text/replacement";
+
+// @doc off
+// Example 1:
+//
+//     a.twitter
+//       +sprite-img("icons-32.png", 1)
+//     a.facebook
+//       +sprite-img("icons-32png", 2)
+//
+// Example 2:
+//
+//     a
+//       +sprite-background("icons-32.png")
+//       a.twitter
+//         +sprite-column(1)
+//       a.facebook
+//         +sprite-row(2)
+// @doc on
+
+$sprite-default-size: 32px !default;
+
+$sprite-default-margin: 0px !default;
+
+$sprite-image-default-width: $sprite-default-size !default;
+
+$sprite-image-default-height: $sprite-default-size !default;
+
+// Sets all the rules for a sprite from a given sprite image to show just one of the sprites.
+// To reduce duplication use a sprite-bg mixin for common properties and a sprite-select mixin for positioning.
+@mixin sprite-img($img, $col, $row: 1, $width: $sprite-image-default-width, $height: $sprite-image-default-height, $margin: $sprite-default-margin) {
+  @include sprite-background($img, $width, $height);
+  @include sprite-position($col, $row, $width, $height, $margin); 
+}
+
+// Sets rules common for all sprites, assumes you want a square, but allows a rectangular region.
+@mixin sprite-background($img, $width: $sprite-default-size, $height: $width) {
+  @include sprite-background-rectangle($img, $width, $height); 
+}
+
+// Sets rules common for all sprites, assumes a rectangular region.
+@mixin sprite-background-rectangle($img, $width: $sprite-image-default-width, $height: $sprite-image-default-height) {
+  background: image-url($img) no-repeat;
+  width: $width;
+  height: $height;
+  overflow: hidden; 
+}
+
+// Allows horizontal sprite positioning optimized for a single row of sprites.
+@mixin sprite-column($col, $width: $sprite-image-default-width, $margin: $sprite-default-margin) {
+  @include sprite-position($col, 1, $width, 0px, $margin); 
+}
+
+// Allows vertical sprite positioning optimized for a single column of sprites.
+@mixin sprite-row($row, $height: $sprite-image-default-height, $margin: $sprite-default-margin) {
+  @include sprite-position(1, $row, 0px, $height, $margin); 
+}
+
+// Allows vertical and horizontal sprite positioning from a grid of equal dimensioned sprites.
+@mixin sprite-position($col, $row: 1, $width: $sprite-image-default-width, $height: $sprite-image-default-height, $margin: $sprite-default-margin) {
+  $x: ($col - 1) * -$width - ($col - 1) * $margin;
+  $y: ($row - 1) * -$height - ($row - 1) * $margin;
+  background-position: $x $y; 
+}
+
+
+
+// Similar to 'sprite-replace-text-with-dimensions' but does not autmaticly set the demensions
+@mixin sprite-replace-text ($map, $sprite, $dimensions: false, $offset-x: 0, $offset-y: 0) {    
+  @include hide-text;
+  @include sprite($map, $sprite, $dimensions, $offset-x, $offset-y);
+  background-image: $map;
+  background-repeat: no-repeat;
+}
+
+// Similar to 'replace-text-with-dimensions' but with sprites
+// To use, create your sprite and then pass it in the `$map` param
+// The name of the image in the sprite folder should be `$img-name`
+@mixin sprite-replace-text-with-dimensions ($map, $sprite, $offset-x: 0, $offset-y: 0){    
+  @include sprite-replace-text ($map, $sprite, true, $offset-x, $offset-y);
+}