Merge pull request #18 from elaval/master

Board local to the sprite
Change menu name to Snap4Arduino in Mac version

Original Application menu in Mac version was “node-webkit”.  It was
changed to Snap4Arduino
Create world.arduino object for global properties

A new object - world.arduino - is created to contain all global
properties and functions related to S4A/Arduino
Merge branch 'issue#19'

Merge with issue#19 branch - creation of world.aruino for global properties
Getting rid of s4a & arduino globals

Blobal (shared) properties & functions specific to s4a & arduino will
go in world.arduino

For example:

world.arduino.firmata
world.arduino.portList
Remove unused (app.nw2) folder from OSX package
Merge remote-tracking branch 'upstream/master'

Upstream merge
Global variables from master
Remove gitignore