CMB-1235: Add enyo.MediaSource as defaultKind for enyo.Video

- Cherry picked from Ryan's branch

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
CMB-1235: Fixes for setting src and sourceComponents cases on enyo.Video

DCO-1.1-Signed-Off-By: Kunmyon Choi kunmyon.choi@lge.com
Merge pull request #836 from enyojs/CMB-1235-kunmyonchoi-new

CMB-1235: enyo.Video should also support components block to add "source"