simplify verbage
add MQTT gateway link
Merge pull request #14 from joshholmes/master

Documentation for n2 and a little on the setup.
Merge branch 'master' of http://github.com/nitrogenjs/website
small tweaks to command line tool PR
Merge pull request #15 from joshholmes/master

added simpleLED.js (first device guide)
tweaks to First Device guide