Added update to streams to assign a channel

[Closes #22]
Merge branch 'master' into dev

* master:
  Fixed travis ENV variable
  Added url obfuscation
  Added http to thumbnails
  Added thumbnail to streams
  Added paperclip to project
Merge branch 'master' into dev

* master:
  Transferring blueprint from apiary.io
  Fix json
  Added ability to remove tags from a stream
  Implemented POST to /streams/:id/tags to assign tags
  Added Tag model to backend
Merge pull request #27 from peepoltv/dev

Adds ability to relate stream to a channel