minimal material property tag
Adding material propety tag seems to work
Added setters to material property tags
Added material method tags
added metadata tag names
have iMesh tag
added tag interface to mesh
added mesh.tag() method
Added computed tags
added lazy tag initilization / binding.
fixed bug with single inetrgal type tag lookup
added contains and iter to mesh
stability improvement to mesh length
Merge pull request #172 from scopatz/tags

Super Awesome Tags For To Blow Your Mind