Added typhoeus gem and locked versions
Updated comment

Format option no longer exists
Renamed hostname option and added verify option
Renamed options argument, and merge in API key
Raise errors if API key or site name is missing
Removed user_agent method
Updated client specs
Custom error classes added
Fetcher class added with support for GET
Webmock gem added
Stubbed responses for albums, pages, posts and topics added
API module added
Added changelog
Updated Readme
Bump version