LIB001-551 changes to facets and sorting
LIB001-558 - updated text for physics
LIB001-547 clickable links on home page. Did not make the makers links as they mainly returned no results
LIB001-560 hover text
Merge pull request #39 from seesmith/master

LIB001-55, LIB001-558, LIB001-547, LIB001-560