Add sticky to home feature

Add @getSticky helper
Add post “best-practices” to homepage
Add a link in the Discover section to the Component Kitchen component catalog.
Merge pull request #100 from luanmuniz/sticky-post

Sticky post
Merge pull request #101 from JanMiksovsky/componentkitchen

Add a link in the Discover section to the Component Kitchen component catalog
Update post dates
Remove CNAME since domain still not configured
Include latest @addyosmani talk
Source formatting #101
Get back to webcomponents.github.io domain - Fixes #102
Include links to Hello World examples
Optimize images (grunt imageoptim)
Decrease mobile threshold
Update link Contributing
Merge pull request #103 from brenopolanski/site

Update link Contributing
Lint spaces (grunt lintspaces)
npm adds bins to the path
Add CNAME pointing to webcomponents.org domain
Use webcomponents.org instead of webcomponents.github.io domain
Update Google Analytics endpoint
Add utility function to identify if a menu item is active #98