Adds tangent function for morphing and skinning in the compiler
Adds tangent function for morphing and skinning in the compiler

gideonmay/osgjs,jtorresfabra/osgjs,jtorresfabra/osgjs,hishamabdelrahman/osgjs,cedricpinson/osgjs,jtorresfabra/osgjs,gideonmay/osgjs,hishamabdelrahman/osgjs,cedricpinson/osgjs,cedricpinson/osgjs,hishamabdelrahman/osgjs,gideonmay/osgjs