5.0 Bring up

- Build CellBroadcastReceiver
- Replace Launcher2 w/ Launcher3 & remove QuickSearchBox
- add PRODUCT_BUILD_PROP_OVERRIDES
- Remove deprecated Music package
- Remove optional "Home Sample" Launcher
- Build Stk (Sim Toolkit)
- Turn off data roaming by defualt
- envsetup: remove cruft
- envsetup: envsetup: add a helper to fix "out/target/common" not being really common (http://goo.gl/Yadnwq)
- ccache: Use system version over prebuilt (http://goo.gl/qcF3ML)
- envsetup: set OUT_DIR to an absolute path always (http://goo.gl/y0q93m) & (http://goo.gl/Gs7lBc)
- Allow cache.img to be disabled (http://goo.gl/ggtU6t)
- Fix file-size stats on OSX (http://goo.gl/hMcPFC)
- enable shared ccache (http://goo.gl/JScBO9) & (http://goo.gl/PpBBZb)
- disable openjdk check for Linux Host OS

Change-Id: I3b0c6b0ab1be0f33f32d6ee9be63140ec2252ec7