added sass setup to readme
# Please enter the commit message for your changes. Lines starting
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# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
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#	modified:   Gruntfile.js
#	modified:   app/app/app.js
#	modified:   app/index.html
#	modified:   package.json
#
# Untracked files:
#   (use "git add <file>..." to include in what will be committed)
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#	.sass-cache/
#	LICENSE
#	app.map.js
#	app/app/templates/about.html
#	app/css/
#	app/js/
Merge remote-tracking branch 'origin/master'