Throw Error when getRepo is called with no arguments
Support writing multiple files in one commit
Add docs for getting programming language counts
Add option for latestCommitSha
added optional sha argument to branch.write
add support for merge (multiple parents) in commit
fixup variable name
Merge branch 'master' in

Conflicts:
octokit.coffee
octokit.js
Merge branch 'optional-write-hash'