Connection.__init__(): set document_class
Merge pull request #94 from hatchddigital/master

Connection.__init__(): set document_class
Acknowledgements
Merge pull request #2 from texuf/master

small fixes and more broken tests
Fixes pushing initial values to documents in collection, new tests run properly.
Remove print statements from group function
Removes debug code from tests
Finalize group and aggregate.
touch readme
Fix python3 failure.
Merge branch 'master' of https://github.com/jeffreybrowning/mongomock
Python 3 fix attempt.
Attempt fix python 3 bug.
Merge pull request #96 from jeffreybrowning/master

Group and Aggregate functionality
Acknowledgements
Add Contributing guidelines
Merge pull request #1 from vmalloc/master

Pulling changes from vmalloc to texuf