Easier MariaDB support in tests

pom.xml

@@ -86,6 +86,7 @@
         <osgi.version>4.2.0</osgi.version>
         <pax.web.version>3.1.2</pax.web.version>
         <postgresql.version>9.3-1100-jdbc41</postgresql.version>
+        <mariadb.version>1.3.7</mariadb.version>
         <servlet.api.30.version>1.0.2.Final</servlet.api.30.version>
         <twitter4j.version>4.0.4</twitter4j.version>