Merge pull request woocommerce#1282 from woothemes/release-2-4-0

Release 2.4.0 release, standards improvements, css compartmentalization, fixes.

Merge pull request woocommerce#1269 from woothemes/release-2-3-0

Closes woocommerce#1266 - pauseInvisible bug, packaged for release.

Renames to version 2.2.2.

Tags version 2.2.1.

Merge pull request woocommerce#799 from woothemes/release-2-2-0

Release 2.2.0