[OpenCOLLADA NetAllied RFQ] using define for hash_set

- fixing MayaGeometryExporter: using define for hash_set
- COLLADAMaxColladaPlugin: adjust max plugin version number
Merge pull request #164 from GerhardMaier/OpenCollada-NetAllied-RFQ-using-define-for-hash_set

[OpenCOLLADA NetAllied RFQ] using define for hash_set