5.0 Bring up

- Build CellBroadcastReceiver
- Replace Launcher2 w/ Launcher3 & remove QuickSearchBox
- 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)
- core: main: remove all the spam about including make files (http://goo.gl/t3HdQv)
- enable shared ccache (http://goo.gl/JScBO9) & (http://goo.gl/PpBBZb)
- disable openjdk check for Linux Host OS

Change-Id: Ic8f707e7c2f492812648a4a5c3cc0b22af5fbb08

Conflicts:
	core/Makefile
	core/product_config.mk