Add dylib/lowercase makefile ignores.
Update GUI gem to use GL core 2.0
Disable selector extension for the time being.
Add build script.
Some notes for the button.
Remove pointless super call.

Base view classes don't implement handle_event as anything other than a
nop, so a call is slower than leaving it out.
Reduce some of the nesting in the Button#handle_event method.
Version 0.0.1.pre3