updated groovy mod version from 2.1.0-final to 2.1.1

Groovy mod 2.1.0-final is using the older groovy version 2.1.1.

The latest stable groovy version is 2.3.7.
As soon vertx is using a groovy class compiled > version 2.3.0, you get
11.11.2014 13:55:33.145 [SCHWERWIEGEND] Failed to instantiate verticle factory 
11.11.2014 13:55:33.147 [SCHWERWIEGEND] java.lang.NoClassDefFoundError: org/codehaus/groovy/runtime/typehandling/ShortTypeHandling 

see http://glaforge.appspot.com/article/groovy-2-3-5-out-with-upward-compatibility

Groovy mod 2.1.1 is using groovy version 2.3.3.