Update gemfile for rubyserial
Fix analog read to work on any arduino board

We were adding 14 to pin number, but this is not valid for MEGA,
to avoid this error, we use the firmata.analog_pins array to work
in every board correctly.
Using firmata dev branch
Updating Gemfile
Removing hybridgroup serialport from readme
Updating version and depencencies
Remove Gemfile.lock and add version dependencies in gemspec
Update .travis.yml
Fixing tests
Merge branch 'dev' of github.com:hybridgroup/artoo-arduino into dev

* 'dev' of github.com:hybridgroup/artoo-arduino:
  Update .travis.yml
  Remove Gemfile.lock and add version dependencies in gemspec
Merge pull request #33 from hybridgroup/dev

Rubyserial