Merge pull request #87 from DannyJoris/7.x

fix for broken request handler check
Merge pull request #89 from DannyJoris/7.x

fixed bad passing of dismax_allowed in the admin form
Merge branch '7.x' of git://github.com/Islandora/islandora_solr_search into 7.x
range slider pt1: ported form elements
first part of cleaning up facet code