Commit Briefs
codereview: make commit -a the default; warn about uncommitted changes at upload
also update README.md for github Change-Id: I7d578a902ffed7f6d69780721e29a1972b6f6992
README: rename to README.md, add markdown for github
Change-Id: I2e644aa2d693692f33d017c00367a734039532f1