A few small demo UI clean ups
Add Grunt tasks
Add centered columns
Merge pull request #32 from blustemy/development

Add Grunt task and centered columns
Merge pull request #33 from MicrosoftDotCom/development

Development
Preceding column fixes, auto 24 column span add
24 col manual column spanning add
Merge pull request #34 from MicrosoftDotCom/development

Development
Fixed gridlines on homepage demo
Merge pull request #35 from MicrosoftDotCom/development

Fixed gridlines on homepage demo