[docs] Tweak README

Fix our repository URL on GitHub.
Add variable definition for Promise doc. #1651
YUI and Loader build for latest Gallery build
Merge branch 'dev-master' into dev-3.x

YUI and Loader build for latest Gallery build
Merge branch 'live-docs' into dev-master
Merge branch 'dev-master' into dev-3.x
[test] Assert that next() bounds the function to the test
[test] Allow next() to define a context
[test] Make sure that next() preserves the original context
Build Test module
Merge branch 'dev-master' into dev-3.x