Feature Embedded YouTube player with accessible controls

#### Description

This plugin attaches HTML-based accessible controls to an embedded YouTube player. It can also create an interactive transcript from a captions file and accommodate several video tracks by creating a video play list allowing switching between videos.

The accessible controls include play, pause, stop, jump forward and backward, adjust volume and mute buttons. The interactive transcript is generated from SBV-style captions; it tracks the current position of the video by auto-scrolling the body of the text and highlighting the appropriate caption line. A user is also able to skip to any place in the video by clicking a corresponding caption line in the transcript. The video play list is shown if more than one track is added to the player.

#### Attribution
The original idea of accessible YouTube player controls belongs to Ken Petri, Web Accessibility Center, The Ohio State University and his Accessible Controls for the YouTube Embedded Video Player library (http://wac.osu.edu/examples/youtube-player-controls/) 

#### Screenshots
![screenhunter_152 aug 15 10 00](https://f.cloud.github.com/assets/2285779/968944/50e3ca04-05b3-11e3-9222-bdeb95f219dc.jpg)
![screenhunter_153 aug 15 10 00](https://f.cloud.github.com/assets/2285779/968945/5218852c-05b3-11e3-973e-b19f3c5307db.jpg)
![screenhunter_153 aug 15 10 01](https://f.cloud.github.com/assets/2285779/968946/5366f508-05b3-11e3-9533-9236880476e2.jpg)