Add .gitignore
Add backend Google App Engine project
Add model package
Add util package
Add controller package
Add main handler
Add index.yaml
Change leaderbaords to return only the user id's
Fix datastore validation exception
Add transaction to match creation
Add inital API reference
Fix code documentation for handlers
Add user request handler documentation
Modify code documents to match API reference
Add missing information to API reference
Fix typo and wrong link in API reference
Fix broken link in API reference