Merge pull request #26 from 25-ventures/bug/cant-call-google-analytics

Bug/cant call google analytics
Remove focus in GA spec
Adjust the GA OAuth code so it will work with TrepScore

- The ENV variables we need have a different name.
- Pass the token into the Client and get the access_token from there,
  rather than setting up the access_token in the top-level Service
  subclass.
- The scope and redirect_uri params are not needed when setting up the
  authorize URL.
Raise a config error for bad accounts and profiles
Map the GA results to the names we expect
Guard now seems to require the cmd for rspec
Add docs for Google Analytics