Recast SVN Version in Flux

I'm currently merging the functionality of dtStatNavMesh and dtTiledNavMesh into one class called dtNavMesh. A first iteration is already in SVN, coexisting with the old classes. I will remove the old classes once I'm done with the merging. If you want to sync to the most recent "stable" version, please sync to revision 72. I hope to get the merging finished next week.

I apologize for the upcoming migration trouble, I think it will be for the better in the long run. If you guys have the time, please take a look at the new dtNavMesh, and let me know if you have some concerns regarding any functionality lost in merging.