Update .travis.yml
Update commands to match new Driver format

- Removed `isPressed` from makey-button (wasn't a function)
- Removed `analogValue` from maxbotix (wasn't a function)
Remove old LED commands
WIP on new sensor tables, updated driver for smother operation.
Added new distance tables for sensors gp2y0a02yk and gp2y0a21yk0f
Remove example and add it to cylon-firmata
Updated to use new commands format.
Merge pull request #29 from hybridgroup/update/commands

Update commands to match new Driver format
Fix ir-range-sensor driver conflict.
Merge pull request #31 from hybridgroup/ir-sensor-upd

Ir range sensor update
Bump version to "0.18.0"