Changed stream API to use geoJSON
Extracted channel's stream logic to the model

Moved the code and added new tests
Improved specs messages to use POST #create syntax
Merge branch 'v0.2' of github.com:peepoltv/peepoltv-api into v0.2

* 'v0.2' of github.com:peepoltv/peepoltv-api:
  db.yml: dds socket to dev and test envs
  Clean up stream POST payload
  Change name property to geo_reference
  Change stream POST payload
  Use geoJSON feature to define streams