API from Magpie-UI + unittests

[fmigneault]

Changes

• moved all API methods under /api directory, and Magpie-UI methods under /ui
• regrouped common imports under 'definition' files
• adds /magpie/__api__ for auto-generated API routes defined from within the code using function decorators
• add /magpie/api route to view API specifications (swagger-ui)
  notes
  • module cornice_swagger used for decorators to populate __api__ should by itself provide a 'swagger-ui' interface, but it didn't seem to work when tested
  • used pyramid's framework to launch 2 apps serviced under /magpie, (Magpie + Swagger-UI)
• add unittest setup with WebTest

[WIP]

• transferring documentation of all routes (only basic ones done like /version)
• add tests gradually with corresponding documentation transferred / validated
• figure out how to /signin with WebTest (valid POST returns Unauthorized access when it shouldn't)

Other

includes PR #64
up on colibri

[dbyrns]