DS-1106 Solr search accent insensitive (ICU Transliteration)

This pull request make use of the ICUFoldingFilterFactory
http://wiki.apache.org/solr/AnalyzersTokenizersTokenFilters#solr.ICUFoldingFilterFactory
to provide a better default for accent management

JIRA issue here: https://jira.duraspace.org/browse/DS-1106