Bump version to 0.6.4 and update README

Update README to describe change to testing mechanism.

Author: rtkrruvinskiy

README.md

@@ -332,6 +332,10 @@ Which results in the following iptables configuration:
 
 Changes
 =======
+* 0.6.4 (June 8, 2014)
+    * Change testing mechanism to use `iptables-restore --test`. This tests
+      all rules at once and results in much better performance. In case of a
+      failure, the rule causing it is included in the exception raised.
 * 0.6.3 (May 30, 2014)
     * Change how default attributes are set in `attributes/default.rb` file for
       consistency with how they are set when they are cleared in

metadata.json

@@ -29,5 +29,5 @@
   },
   "recipes": {
   },
-  "version": "0.6.3"
+  "version": "0.6.4"
 }

metadata.rb

@@ -3,7 +3,7 @@
 license          "BSD"
 description      "Simple LWRP and recipe for managing iptables rules"
 long_description IO.read(File.join(File.dirname(__FILE__), 'README.md'))
-version          "0.6.3"
+version          "0.6.4"
 name             "simple_iptables"
 
 supports "debian", ">= 6.0"