Fix formatting of PixelGraphicsOutput class.

Add error handling for an array index boundary violation if the graphics
output tries to draw when the canvas is still the default size.
Set up global audio processing state in sketch.
Fix classpath to include standard Processing libs.
Add AudioContext to simplify audio resources.
Check for updated library jars when exporting.

Previously, rake only checked whether the sketch sources had been
modified to decide whether the exported sketch was up to date. This
caused an issue when only the library jar file changed.
Log server output to wonderdome.log.
Disable audio input for now.
Improve ColorGradient and ColorCycle mode.

Added a density control to the mode and simplified how colors are
calculated by the gradient class, removing the need to specify density
or shades.
Merge branch 'master' of github.com:mvxcvi/wonderdome