Check project names in egg storage

[jpmckinney]

From #421

Probably it would be also good to make sure EggStorage is not storing invalid names. That's because resources can be configurable, so user can override our resource and put his own resource which is not safe.

@pawelmhm I'm not entirely sure what the intended behavior is?

If I understand correctly, it's to repeat some of the project name sanitization logic in the eggstorage, since a user can replace webservices with their own, and they might not sanitize the project name in those webservices.

[jpmckinney]

Done in 858c408