First pass at implementing the Grass live wallpaper in RenderScript.

This change also adds second(), minute() and hour() to the RS library.
diff --git a/rsScript.h b/rsScript.h
index 7dd2b61..a8e04a6 100644
--- a/rsScript.h
+++ b/rsScript.h
@@ -43,6 +43,9 @@
         float mClearDepth;
         uint32_t mClearStencil;
 
+        uint32_t mStartTimeMillis;
+        const char* mTimeZone;
+
         ObjectBaseRef<ProgramVertex> mVertex;
         ObjectBaseRef<ProgramFragment> mFragment;
         //ObjectBaseRef<ProgramRaster> mRaster;