Better way to determine project layout in ERFoundation

[hugithordarson]

ERFoundation currently checks the Eclipse .project file to see if it contains a maven nature and then determines from that if the project's layout is "maven style" or "Fluffy Bunny" (NSMavenProjectBundle or NSFluffyBunnyProjectBundle).

Problem is, not all maven projects are "maven style", some use Fluffy Bunny project layout with maven. A better approach might thus be to check for the location of the "Properties" file in the bundle instead. It's generally present in projects, so if it's under /Resources/Properties it should be a good indicator that the project layout is actually Fluffy Bunny.

Oh, and a second benefit of all this is that we lose the dependency on the Eclipse .project file.

[hugithordarson]

Reopened (accidentally closed by merge in a PR linked to the wrong issue)