Allow setting Vimeo player url query string
Described vimeo_url option in README
Specify video_height: false behaviour
Rename vimeo_url to vimeo_params
Renamed vimeo_url to vimeo_params in README

* Hope there is no more place to rename it.
Query string test is 1.8 friendly
Merge pull request #13 from paneq/master

vimeo_url and video_height options for Vimeo.