Add colors from Sphero Rubygem

- Adds colors from [Sphero gem][1]
- Adds function to pick a random color, and to find one from a string
- Adds support for using them in adaptor (setColor and setRandomColor)

Example usage from Cylon:
```coffeescript
Cylon = require 'cylon'

Cylon.robot
  connection:
    name: 'sphero', adaptor: 'sphero', port: '/dev/rfcomm0'

  device:
    name: 'sphero', driver: 'sphero'

  work: (me) ->
    me.sphero.setColor 'papayawhip'

.start()
```

[1]: https://github.com/hybridgroup/sphero/blob/d55ef98/lib/sphero.rb#L265