Update slurp_all_MODS_to_solr.xslt

Where a tag has a @type attribute, and the attribute value has a space in it, the fields get named e.g. “mods_accessCondition_use and reproduction_ms”.  Though you can still search on these fields, they won’t display through the parts of the Islandora interface that show the Solr data. Change replaces spaces with "_" in field names.
Merge pull request #7 from karenhanson/patch-1

Update slurp_all_MODS_to_solr.xslt