camlibot: set GOROOT properly, stricter hash checks, simplify

Change-Id: I27fed6c52eeae239b9f8a17600331fc08dfd9ef7
Merge "camlibot: set GOROOT properly, stricter hash checks, simplify"
android: work around a TextView.setText efficiency to not stall the event loop

Change-Id: I77dd1da8f691d5b4844a6bb0f9b2392474354998
Merge branch 'master' of https://camlistore.googlesource.com/camlistore