Updated channels API
Added API to assign stream to channel
Added specification for handling tags
Fixed GeoJSON object

[Fixes #23]
Merge pull request #24 from peepoltv/fix-geojson

Fixed GeoJSON object
Merge branch 'master' into nuve-test

* master:
  Fixed GeoJSON object
  Added specification for handling tags
  Added API to assign stream to channel
  Updated channels API