* Add support to both the twitter and twitterstats modules for authenticating using both bearer tokens as well as consumer key + secret.
* A bearer token is defaulted to if it's supplied
* Add this support to both the twitterstats module as well as to the existing twitter module, modifying its functionality to re-use the same HTTP client and handle authentication upfront via oauth2
Rather than referencing wtc.Config, instead pass the global config
Also, look up config for the module early and pass that in sooner, to deal with fewer long paths and get rid of the
ConfigKey variable
