Documentation math

Merged with ofSite documentation, and some grouping of stuff

All math files have been documentarized now

Also added some OF_DEPRECATED messages on some ofVec2f, ofVec3f and ofVec4f functions that are marked as deprecated since 006. 

Haven't done much editing with the text but just copied from ofSite. 

Preview:
http://halfdanj.github.io/ofDocGenerator/ofMath.html
http://halfdanj.github.io/ofDocGenerator/ofVec2f.html