Merge pull request #33 from peckrob/beta

Merge beta into master

Fix formatting.

Fix a small bug that could result in failed feeds in the event of an …

…unclean shutdown.

Add types for servos to support raw GPIO.

Modify feeder to store the GPIO object and terminate it when done.

Various small bugfixes identified by a bit more testing.

Add popper as a direct dependency.

Update readme.

Update changelog.

Update changelog with 0.2 release.