Allow to specify diff paths
Merge pull request #19 from skv-headless/master

Allow to specify diff paths
Add compare docs to readme

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Version 4.1.0.pre

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
Replaces gitlab-grit reference w/ forked version.
Adds Commit.quick_diffs wrapper method.

Just calls the grit equivalent.
Adds repo.tag_names_contains method.

Returns collection of tags which contain a given commit.