video js implementation
- use video.js for custom video stimuli server
- implements methods recorderShow and recorderHide
Merge branch 'master' of https://github.com/CrowdEmotion/respondent-video-capture-kit

# By Diego Caravana
# Via Diego Caravana
* 'master' of https://github.com/CrowdEmotion/respondent-video-capture-kit:
  Added license