Adds uv set name export to Maya plug-in
Optimizes out default uv set name export from the Maya plug-in
Adds uv set name import to Maya plug-in
Adds uv sets export to Maya plug-in
Adds uv sets import to Maya plug-in
Merge pull request #13 from janmroczkowski/master

Adds uv set name export to Maya plug-in
When writing multiple UV sets, use currentUVSetName to determine which one
should be the primary UVs for the mesh and NOT the first UV set.

Also do some small style updates.