helloworld project/app renaming

Rename Hello World project/app

Note:

Rename all refs to 6701_helloworld_renaming -> 6066-connection-bugfixing before merging.

Related Pull Requests:

https://github.com/feedhenry-templates/helloworld-app/pull/1
https://github.com/feedhenry-templates/helloworld-mbaas/pull/1
https://github.com/feedhenry-templates/helloworld-project/pull/1