API Refactor

[jescalan]

Just some small adjustments to the API to make everything smoother.

• Eliminate callbacks because promises are better
• Expose Ship as a class, makes persisting state easier, less repetition
• Add a couple commands for checking and writing config files
• Adjust deployer list to more accurately reflect our priorities
• Reword some pieces of the readme to have it read smoother

Then, complete rewrites of the heroku and github pages deployers to make them work smoothly with the new API, and eliminate external command line dependencies.

[coveralls]

Changes Unknown when pulling 8e68ee0c2a9d48cb5e0cf4765ccf15f9df26df0d on refactor into \ on master**.

[coveralls]

Changes Unknown when pulling 7f055fe680fc8468bcde8f40aae1d0d421942d7e on refactor into \ on master**.

[coveralls]

Changes Unknown when pulling 4856a854ec6b03ca965c59f2a287b97c91de13b2 on refactor into \ on master**.

[coveralls]

Changes Unknown when pulling 81ad97fec3b4f0ff909c7e01aff1afa1f6487111 on refactor into \ on master**.

[coveralls]

Changes Unknown when pulling 8c0275d5ae65db3d845f8b9c5fefad5405267909 on refactor into \ on master**.

[kylemac]

:thugs_tear:

[jescalan]

Oh man, that's a big deal. Not many of those are shed! :watermelon: