First attempt at generating autodocs of functions

docs/build/examples/examples.md

docs/build/fig/beaglebone_black_pinmap.png

docs/build/fig/flashBB.png

docs/build/index.md

docs/build/lib/functions.md

docs/build/lib/io_devices.md

docs/build/testing.md

docs/mkdocs.yml

docs/src/examples/examples.md

docs/src/fig/beaglebone_black_pinmap.png

docs/src/fig/flashBB.png

docs/src/index.md

docs/src/lib/functions.md

docs/src/lib/io_devices.md

docs/src/testing.md

src/BeagleBone/BeagleBone.jl

src/BeagleBone/GPIO.jl