Allow for NxM layout and in-place rotation of items on homescreen.

Currently, rotation is disabled as designs are still in flux, but the NxM grid is enabled (8x4).

Change-Id: I0026f88c674719e3d67de6d6d481d2d4cd606362

src/com/android/launcher2/SymmetricalLinearTween.java

@@ -17,9 +17,7 @@
 package com.android.launcher2;
 
 import android.os.Handler;
-import android.os.Message;
 import android.os.SystemClock;
-import android.util.Log;
 
 /**
  * Provides an animation between 0.0f and 1.0f over a given duration.