Object picking contribution from Ruan Moolman - intergrated into new Phoria.View.
 - Also includes utility methods to convert planer to polar and back plus poly/line intersection tests.
Added picking demo page test0p.html - showing highlight when cube is picked.
Moved mouse events into Phoria.View class.
 - phoria-view.js is an optional include to provide additional functionality such as high-level mouse event handling and object picking.