Merge branch 'different_message_when_no_result' into 'master'

Different message when no result is returned on ldap group query

Fixes #103

/cc @sytse @jacobvosmaer @job

See merge request !156

app/assets/javascripts/ldap_groups_select.js.coffee

@@ -24,3 +24,5 @@ $ ->
       formatResult: ldapGroupResult
       formatSelection: groupFormatSelection
       dropdownCssClass: "ajax-groups-dropdown"
+      formatNoMatches: (nomatch) ->
+        "Match not found; try refining your search query."