Mirage 2 Responsive theme for the XMLUI

Mirage 2 is a new theme for the XMLUI built on the Bootstrap framework. It also leverages SASS, Grunt and Bower.

Example of a demo repository running mirage 2:
http://atmire.com/preview

This contribution has been evaluated by a community of early adopters, some of which are already running the Mirage 2 beta in production:
https://mdc.usao.edu/
http://sc.lib.muohio.edu/
http://www.tara.tcd.ie/

This contribution wouldn't have been possible without the support of the World Bank, for which we have initially developed a responsive theme that later on lead to many of the concepts included in Mirage 2.

Information:
https://atmire.com/website/?q=download-mirage-2 (Beta Distribution)
http://www.slideshare.net/bramluyten/mirage-2-a-responsive-user-interface-for-dspace

It is our ambition to contribute this to the DSpace 5.0 core initially as an optional theme.

The link to the pull request will be added here shortly. Developer documentation will be provided as markdown (Readme.md) as part of the code. Documentation within the DSDOC5X space will be added as wel.