Add selected state to menu items

This adds an `is-active` class name to the currently-active menu item.
**Note:** this does not add any styling, just the hook.
Adding intl and intlGet helpers, remove installation section.
Add "Getting Started" section to top of Guide
Merge pull request #108 from ericf/menu-selected

Add selected state to menu items
styling tweaks to integration splash area
removing ol in favor of h4
rewrite
Merge pull request #110 from ericf/get-started-landing

Add "Getting Started" section to top of Guide
Merge pull request #111 from jconniff/master-nav

styling tweaks to integration splash area
reordered sections some
updating headers
Merge pull request #109 from yahoo/hbs

Adding intl and intlGet helpers, remove installation section.
adding intl example for handlebars integration page
Merge branch 'hbs'
Add "FormatJS" to title on About page
adding numbers to the h4 for nodejs and browser
tweaked install section based on feedback
added link to dust library
Merge pull request #112 from drewfish/dust

dust integration page refrob