Initial Podspec

Allows installation through git repo, like `pod 'CocoaHoedown', :git => 'https://github.com/vhbit/CocoaHoedown.git'`.

Currently it doesn't pass `pod spec lint` as:

- requires a better description (different from summary, can't imagine what else could be added)

- requires `s.source` to be in form `{ :git => "https://github.com/js/CocoaHoedown.git", :tag => "SOME_TAG" }`, so requires a tag on original repo