Change bird constructor to reuse audio context
Convert presets parameters from array to hashmap
Merge pull request #1 from zz85/master

Change bird constructor to reuse audio context
Add update( paramaters ) call for bird object
Adds gui knob controls for tweaking (using @oosmoxiecode xgui.js)
Merge pull request #2 from zz85/master

Add Gui Controls
Merge branch 'master' into gh-pages