Updated client base module to use a RequestContext class that will have all of the default configuration (base api url, auth_token, optional request parameters, etc.).  The RequestContext object will create and house a requests.Session object that is used to make the API requests.  With this new context, many of the prior modules can be removed.  For the moment, the section method tests are being skipped.  The tests for the base module have been rewritten to account for the RequestContext class.
Update existing sections methods to use RequestContext class.  Refactor unit tests in sections to reflect move to a RequestContext.  Clean up client base tests to make better use of mock.ANY.
Merge pull request #13 from Harvard-University-iCommons/feature/configuration_object

Feature/configuration object