Update CHANGES.md and build.xml for b7 release.

Author: bagnell

CHANGES.md

@@ -4,7 +4,7 @@ Change Log
 Beta Releases
 -------------
 
-### b7 - xx/xx/2012
+### b7 - 08/01/2012
 
 * Breaking changes:
    * Removed keyboard input handling from `EventHandler`.

build.xml

@@ -74,7 +74,7 @@
 	<property name="build.minification" value="false" />
 
 	<!-- Inputs -->
-	<property name="version" value="b6a" />
+	<property name="version" value="b7" />
 	<property name="sourceDirectory" location="Source" />
 	<property name="shadersDirectory" location="${sourceDirectory}/Shaders" />
 	<property name="examplesDirectory" location="Examples" />