generic wrapper
remove get_promotion from Client
Update ReadME
Merge pull request #1 from tiffanypeon/updated_readme

Update ReadME
first draft campaign class - incomplete
not working, at weird strip error
sketch for campaigns wrapper
Sketching
Merge remote-tracking branch 'dinshaw/campaign_class' into campaign_class
Pre-gem release clean up
Add token specs
Refactor network requests spec. Handle etag exceptions.
Continue refactor
Finalize refactoring
Service object refactor
Move private_key to config
Version bump
Add request exception handling; Fix etag retry
Pend network request; Version bump
Update readme