code review comments
remove unused var
Merge branch 'jasonsanjose/jenkins' into jasonsanjose/jenkins2

Conflicts:
	tasks/setup.js
move downloaded files to downloads/
rename appshell.gyp to work around node-gyp npm install issues
fix appshell gyp and node download on mac
Merge branch 'jasonsanjose/jenkins' into jasonsanjose/jenkins2

Conflicts:
	Gruntfile.js
	tasks/setup.js
use common.platform() name instead of process.platform