Fix for https://jira.duraspace.org/browse/ISLANDORA-868
Fix for https://jira.duraspace.org/browse/ISLANDORA-895
Output better XML using cleanup_mods.xsl

Changes originially from Caitlin Nelson of FLVC.  Removes empty
attributes, empty elements, and elements containing only attributes
Merge pull request #108 from nigelgbanks/7.x-uncheck-checkboxes

Fix for https://jira.duraspace.org/browse/ISLANDORA-868
Merge pull request #107 from nigelgbanks/7.x-association-template

Fix for https://jira.duraspace.org/browse/ISLANDORA-895
Merge pull request #109 from lyrasis/enhance-cleanup_mods

Output better XML using cleanup_mods.xsl