engine_api.md:

Added a markdown file for API docs.
engine_api.md:

Started documentation REST API methods.
engine_api.md:

Fleshed out more of the engine API docs.
engine_api.md:

Added docs for calc run methods.
engine_api.md:

Fixed a typo.
engine_api.md:

Fixed another typo.
Merge pull request #10 from larsbutler/api-doc

Documentation for the REST API

[r=micheles]