Remove legacy bootloader

Change-Id: Ie2ad586913f12f6dc170e1c5b4b49d47717f702c
Use android_sdk repository on Github

Change-Id: I04bae5df9ab34112297983ba921cfc16487dfe3c
Update CyanogenMod manifest to allow checkout of android_development

Change-Id: Ib95265ba6f928e262079cbcc34e991d7bcf5a1e9