Issue #64 Created GhGistsTest class, canCreateFiles() test method.
Issue #64 Added canIterateThroughGists, canRetrieveSpecificGist test
methods.
Issue #64 Updated @todo puzzle comment in GhGists.java.
Merge pull request #67 from carlosmiranda/64

#67: pull request Issue #64 Unit test has been created for GhGists