Copy Changes from reactAddShops Branch

+ Adds shops nav item to default props.
+ Large: Reduce margin-right of nav-items from 10px to 9px. Every pixel
counts.
+ Large: Reduce right position of marketplace from 100px to 92px to make
shops link visual distance 20px away from search icon.
+ XLarge: Move breakpoint up to 1100 to allow room for nav item spacing
increase.
+ XLarge: Adjust marketplace position to maintain 20px visual distance from
search icon.
+ Mark package as private in package.json and bower.json.
Disable Shops by Default

+ Add mechanism in NavGroup and NavItem for disabling items.
+ Disable shops by default.
+ Add toggle checkbox on DemoControls to endable/disable shops.
+ Default DemoControls shops to enabled.
Set Version in package.json to v0.2.1
Merge pull request #15 from deseretdigital-ui/reactShopsCherry

Add Shops to Marketplace