0.7

  - Dramatically increased test coverage and documentation
  - api
    - Conform to the [cppp.io](https://github.com/hybridgroup/cppp-io) spec
    - Add support for basic middleware
    - Add support for custom routes
    - Add SSE support
  - ardrone
    - Add optional parameter to specify the drones network address
  - core
    - Add `Once(e *Event, f func(s interface{})` Event function
    - Rename `Expect` to `Assert` and add `Refute` test helper function
  - i2c
    - Add support for MPL115A2
    - Add support for MPU6050
  - mavlink
    - Add support for `common` mavlink messages
  - mqtt
    - Add support for mqtt
  - raspi
    - Add support for the Raspberry Pi
  - sphero
    - Enable stop on sphero disconnect
    - Add `Collision` data struct  
  - sysfs
    - Add generic linux filesystem gpio implementation