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

AndroidManifest.xml

@@ -75,6 +75,7 @@
             android:stateNotNeeded="true"
             android:theme="@style/Theme"
             android:screenOrientation="nosensor"
+            android:configChanges="orientation"
             android:windowSoftInputMode="stateUnspecified|adjustPan">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />