Created a singleton of the MapMyFitness object, and added tests to go with it.
Trying to make python3 happy with the singleton's use of super.
Moving some tests around.
Removed a test that was moved.
Wrote more tests around the MMF singleton.
Added a test to get 100% coverage on the MMF.instance() method.
Merge pull request #1 from bnekolny/mapmyfitness_singleton

Created a singleton of the MapMyFitness object, and added tests against the singleton