feature: ScrollScene.startOffset

added method `ScrollScene.startOffset` to get the current scroll offset
value at which a scene will trigger.
Also renamed `startPosition` to `triggerOffset` for clarification
purposes.
Left startPosition for compatibility, but marked as deprecated.

Author: janpaepke

ScrollMagic.jquery.json

@@ -1,6 +1,6 @@
 {
     "name": "ScrollMagic",
-    "version": "1.0.6",
+    "version": "1.0.7",
     "title": "ScrollMagic",
     "author": {
         "name": "Jan Paepke",

bower.json

@@ -1,7 +1,7 @@
 {
   "name": "ScrollMagic",
   "description": "The jQuery plugin for magical scroll interactions.",
-  "version": "1.0.6",
+  "version": "1.0.7",
   "homepage": "http://janpaepke.github.io/ScrollMagic/",
   "author": {
     "name": "Jan Paepke",