A new version of OBS-web has been released at https://github.com/Niek/obs-web / http://obs-web.niek.tv/
Transitions are now supported, as well as profiles, collections, and more.
Some new features have been added: fullscreen support, wakelock (currently Chrome Canary only), studio mode. Let me know if you have any comments.
GitHub link: https://github.com/Niek/obs-web
Live link: http://obs-web.niek.tv/