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
diff --git a/res/layout-xlarge/launcher.xml b/res/layout-xlarge/launcher.xml
index 092e018..17a5b84 100644
--- a/res/layout-xlarge/launcher.xml
+++ b/res/layout-xlarge/launcher.xml
@@ -29,14 +29,14 @@
         android:id="@+id/workspace"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        launcher:defaultScreen="2">
+        launcher:canonicalDeviceWidth="8"
+        launcher:canonicalDeviceHeight="4">
 
         <include android:id="@+id/cell1" layout="@layout/workspace_screen" />
         <include android:id="@+id/cell2" layout="@layout/workspace_screen" />
         <include android:id="@+id/cell3" layout="@layout/workspace_screen" />
         <include android:id="@+id/cell4" layout="@layout/workspace_screen" />
         <include android:id="@+id/cell5" layout="@layout/workspace_screen" />
-
     </com.android.launcher2.Workspace>
 
     <com.android.launcher2.DeleteZone