add test runner script and unit tests folder
started test_User.py
moved unit tests out of backend
tests for User class
fixed indentation
moved testrunner to root so it can access /backend for import
pointed testrunner to unit test folder
added __init__.py to backend so test runner could import folder as a module
added blurb on Unittests to README
changed test file to be more generic (file focused not class focused)
added placeholders for tests
added option to override SDK_PATH
added stripe to path so module can be imported
added placeholders for other tests in main.py
fixed test for User.createOrUpdate
Merge branch 'master' of https://github.com/MayOneUS/app-engine into add-unittest-framework

Conflicts:
	README.md
minor cleanup
added test_Model.py to reflect changes in /backend
updated test_Main.py to reflect changes in /backends/main.py
removed misleading comment