finishing up JSDocs for PVector
Merge branch 'master' of github.com:lmccart/p5.js
radians() and degrees() should always do conversion #163
fixing atan2 which outputs an angle
cleaning up trig functions for new way that degrees() and radians() work, also unit tests
new distribution
Merge pull request #172 from shiffman/master

Refactor of trig functions and tests