Minor formatting change
Extract handlers package
Extract mongo out into separate file
Bump release versions

Also, move mgo to git version rather than bzr.
Add write API with append data functionality
Introduce DataSetStorage interface

First step towards making this more testable.

Also has the nice benefit of extracting mongo functionality out into
separate file.
Add update handler
Extract function for registering handlers
Tests should fail early
Get configuration from environment

Remove parameter parsing.
Use libraries to render JSON
Extract health check handling
Reformat travis, exclude tagged releases
Use ginkgo and gomega for testing

- Big change, rip out all the things, make them smaller and more
  testable
- Prefer concrete structs eg config_api.DataSetMetaData to maps
Merge pull request #4 from jabley/feature/linked-api

Make things smaller