Removed unsued options, fixed query url
Fixed bug in search, added headers

 - Updated search response types to reflect upstream Twitch API changes
 - Fixed query strings in search
 - Added accept and client-id headers to the http request
 - client-id is read from environment variable GO-TWITCH_CLIENTID
Merge pull request #3 from rojters/bugfix/search

Bugfix/search
Fixed error handling, added tests

 - Error handling of http response codes
 - Added basic tests for games, ingests, search, teams and videos
 - Updated response types and functions to reflect upstream Twitch API changes
Merge pull request #4 from rojters/bugfix/error_handling

Fixed error handling, added tests
Add travis-ci
Add usage section to README.md
Fix install command