Connect with MongoClient if exists. Class found in driver >=1.3.0. Mongo class deprecated
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Merge pull request #9 from moderndeveloperllc/master

Connect with MongoClient if exists.
[#9] Fixes to ensure new functionality works

- Updated tests to check for MongoClient, and branch assertions based on its
  existence.
- Added a number of dev dependencies to ensure tests can run.
Merge branch 'feature/9'

Close #9
Close #11