Merge pull request #25 from muan/master

Add youtube embed url
Update spec setup
Update README [ci skip]
Fix Gemfile
Release 1.2.0
Update Gemfile [ci skip]
Complete refactoring

close #26
Release 1.3.0
Update LICENSE year [ci skip]
Fix spec on 1.8
Add regex for player.vimeo.com/video
Add spec for player.vimeo.com/video/*