Added annotation filtering by type
Added machine-only posts parameter to ANKClient
Added read token support for fetching ANKFile objects
Added support for fetching subscribed ANKChannel objects with specific type
Added Ohai
Merge pull request #49 from stevestreza/master

API additions (annotation filtering by type, machine-only posts, read-token support, and specific channel-type fetching) to support Ohai. As well, Ohai is added to the readme.