Semi fix for pwm
partial fix to gpio stuff (limit what can be exported)
semi update lut stuff
semifix. PWM stuff mostly works. ADC should work.

CLEANUP NECESSARY
Interops with non-BBB platforms
(Almost done) pin refactoring
Fix minor typo
Small fixes + add ability to un/export pins from pin_test
Made pinout diagrams
Merge pull request #43 from jtanx/master

Fixes and stuff for pin control