Making python unit tests run again using grunt-shell.
Fixed test run script.
Merge pull request #251 from phoglund/grunt-with-nose

Making python unit tests run again using grunt-shell.
Merge branch 'apprtc-collider' of https://github.com/GoogleChrome/webrtc into prerender
Fix double joining due to prerender
Fix double joining due to prerender
Merge branch 'prerender' of https://github.com/jiayliu/jiayl-webrtc into prerender
Merge pull request #254 from jiayliu/prerender

 Fix double joining due to prerender