Documented how to run unit tests
Added docs about what's on Launchpad
Added docs on Gerrit with pointers to wiki.
Added docs on Jenkins: how to access, what it does
Clarified that running unit tests doesn't mean you can fully run OpenStack.
Change-Id: I33fa9d2f271631a1a9aceaa5d4fd465198bf51d4
Lorin Hochstein