Add branch names to valid grammar
Add branch names to valid grammar

https://developer.github.com/v3/repos/#get-branch

matthewbauer/octokat.js,bitoiu/octokat.js,sanemat/octokat.js,philschatz/octokat.js,philschatz/octokat.js,gmaclennan/octokat.js,sanemat/octokat.js,philschatz/octokat.js,matthewbauer/octokat.js,bitoiu/octokat.js,gmaclennan/octokat.js