Fix sync by using 4.2.1r1.2 for hardware

Following repos aren't updated in AOSP yet:
hardware/broadcom/wlan
hardware/invensense
hardware/samsung_slsi/exynos5
hardware/ti/omap3
hardware/ti/omap4xxx
hardware/ti/wlan
hardware/ti/wpan

Use latest sources (4.2.1r1.2) for now to fix 
Merge pull request #1 from WoH/jellybean

Fix sync by using 4.2.1r1.2 for hardware
Add external/eigen
TEMP:fix libhardware tag

Change-Id: I58d4ad382293ece882ef9ea0caa9981e9a204c32
Merge pull request #2 from WoH/jellybean

Add external/eigen
update README

Change-Id: I3e354a36e9c0f8a3a2ed2c55ad35cb8e1051dbad
update manifest for crespo

Change-Id: I34531336b5173a31a3f40e02c781f82eef4888c3