Establish database schema
Begin implimenting models
Update database schema

- Added has_sample_number to asset_types
- Move comment association on to asset
- Added study to asset
Add basic model validations and associations
Add db/seeds file

Our seeds are empty, but rake starts complaining
if this is missing.
Update rake to 10.3.2
Comments are not required
Add specs to asset
Outline controller interface
Add empty asset and batch controllers
Add new and index endpoints
Hook controllers into routes
Initial commit of presenters
Merge pull request #2 from JamesGlover/develop_database_schema

Develop database schema