Find the commit-ish reference in a git url.
const findCommitIsh = require('find-commit-ish');
findCommitIsh('git://github.com/tkellen/find-commmit-ish.git'); // master
findCommitIsh('git+ssh://git@github:find-commmit-ish.git#branch'); // branch
findCommitIsh('git+ssh://git@github/find-commmit-ish.git#tag'); // tag
findCommitIsh('git+http://git@github/tkellen/find-commit-ish.git#d716b2a'); // d716b2a
findCommitIsh('git+https://git@github/tkellen/find-commit-ish.git#d716b2a'); // d716b2a- 2014-05-14 - v0.1.0 - initial release

