Have longbow auto change the user directory case

[jimboid]

So Longbow is moving away from having the capital L in its code base and directory structure. Longbow version 1.5.0 should change the existing user directory from .Longbow to .longbow automatically and inform the user this has taken place. For first time installers this should simply be skipped.

[jimboid]

Adding documentation tag, this code is on the development branch. User documentation will need changing at release.