Replace /updates/ with redirect to Releases page on GitHub

Closes #129
committed by screwdriver build
Update marketing.css

Fixed issue [#116](https://github.com/yui/pure/issues/116) reported in Pure repository
Added prefixed versions of box-sizing property
Merge pull request #132 from AurelioDeRosa/master

Updated marketing.css
Merge pull request #130 from ericf/releases

Replace /updates/ with redirect to Releases page on GitHub
committed by screwdriver build
Change /updates/ redirect to a 302 so it's not cached

Once we get the blog up, we'll want to redirect /updates/ to that.

For now, it should be set to a 302, and a "Releases" menu item should be added later.
committed by screwdriver build
Add Alternate CDNs section to Customize page and include cdnsjs

Closes #133
Update Alternate CDN table heading
Link to cdnjs' website, and make Pure version variable in CDN URL
Fix improper use of `pure-u` and `pure-u-1` and nested grids

This corrects the uses of nested grids, and how `pure-u` and `pure-u-1`
are used.
Merge pull request #136 from ericf/grid-use-fixes

Fix improper use of `pure-u` and `pure-u-1` and nested grids
committed by screwdriver build
Add note about alternate CDNs lagging from the latest version of Pure
Merge pull request #135 from ericf/cdnjs

Add Alternate CDNs section to Customize page and include cdnsjs
committed by screwdriver build
Update Pure to 0.2.1 and update file sizes
Bump version to 1.4.0