Revert "Changes to get cayley running on appengine again."

This reverts commit 40c0db4f1dcae205e34217dbeacd493665235286.
Revert "Appengine datastore backend implementation, beta version, not optimized. \n CR: nobody \n Tests: Unit tests, manual"

This reverts commit 6997ef1ef6566f6ab24c0aa1b1af039b1bd04851.
Revert "Moved appengine module files to their own directory so they don't interfere with the 'goapp' tool"

This reverts commit 835ed5c7512cbe147d016fb3d24deb0d39ab5a39.
Revert "Added functionality so quadstore is generated per request (if needed) for the new appengine backend \n CR : nobody \n Tests run: unit tests"

This reverts commit d0f5e48acfd552cc337eb360fe2e2d83ce7c22eb.