Upgrade from enquire.js v1.5.5 to enquire.js v2.1.0

Changelog
v2.1.0 (2013-09-13)

Cumulative bug fixes
UMD support
v2.0.0 (2013-04-17)

Tinier than ever — now only 0.8kb minified & gzipped
Improved performance — resize events replaced with matchMedia.addListener
Simplified API — listen and fire no longer required
If you are upgrading from v1, be aware that there are some small breaking changes.

listen and fire are no longer needed as of v2, and have been dropped from the API. Removing any usage of them in your code is all that is required. Also, as enquire no longer relies on resize events you must make sure your polyfill supports matchMedia.addListener. Details of this can be found in the legacy browser section.

v1.5.6 (2013-01-30)

Fix bug with missing useCapture parameter on addEventListener