Support for logging to MongoDB, update gitignore

- exclude .bak files from git
- simple logging of door actions to db (Up, Down, Btwn)
- add mongoose to required modules
- bump version # to 0.0.2
Update package name to 'garagecontrol'
version bump, change to postgres, add emails, gpio

- switch to postgres instead of mongoose
    - add function to log to db
- add email upon status change via nodemailer
    - add send_email function
- relocate gpio init
- enable ability to not have gpio_read_state_pin emit change
  signals
- version bump 0.0.2->0.0.3
add AppleDouble to gitignore