repopick: allow running from a subdir of ANDROID_BUILD_TOP

Change-Id: I6dfcd5dfe700174ed87dc8627b23519c62b4cb27
s/cyanogenmod.com/cyanogenmod.org/

* And fixup a wiki link while I'm at it.

Change-Id: I0355b9a47eac1becc07e81659fbb2d11b14ece36