Replaced notice back button
Add icons for thesis, music sheets, proceedings, website
Add custom filter for encoding pbm with "actes de conférences"
Revert "Adding matchMedia polyfill for IE9"

This reverts commit d97e0b82f991df19f259b5271d1961c86b716dda.

Conflicts:
	.gitignore
Edited filters select boxes in mobile views and changed px to em for font styles
Added 'apply filter' button at the top of filters screen
Added 'See more results' button at the bottom of results screen
Updated font awesome
Styled 'see more results' icon and link
Styled reset icon for applied filters
Renamed 'icon-search' to 'fa fa-search'
Styled reset filters icon for web screen
Updated icons
Styled search reset button
fix font-awesome CDN + fix icons (twitter, angle-left)
Rolled back to the default search cancel icon
Styled reset applied filters
Filter empty values from facets
Keep facets tab open even when updating facet content
Small fixes