updated Search API Solr to 1.15

wcm_base.make

@@ -145,7 +145,7 @@ projects[rules][subdir] = contrib
 projects[rules_conditional][version] = 1.0
 projects[rules_conditional][subdir] = contrib
 
-projects[search_api_solr][version] = 1.14
+projects[search_api_solr][version] = 1.15
 projects[search_api_solr][subdir] = contrib
 projects[search_api_solr][patch][1414838] = http://drupal.org/files/issues/search_api_solr-partial_word_matching-1414838-21.patch