Adding GitImplementation of Ground and tests#4

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avinash-arjavalingam wants to merge 4 commits intoground-context:masterfrom

avinash-arjavalingam:master

Commits on Mar 6, 2018

Add ground.py to implement GitImplementation and testing file test_ground.py
aviarjavalingam
committed

Commits on Mar 20, 2018

Correct errors, add commit for every creation, save the objects in json files
aviarjavalingam
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Commits on Apr 14, 2018

Removed unnecessary classes, comments with old code, and noinspect
aviarjavalingam
committed

Commits on Apr 15, 2018

Made the requested changes, including adding README.md, have class variables for class names, and fixed the latest id method
aviarjavalingam
committed