Set the value of a WSDL enumeration restricted simple type doesn't work

WSClient create method does not handle XSD enumerated restricted simple type.

A problem description is here:
http://www.nabble.com/How-do-I-set-the-value-of-a-WSDL-restricted-simple-type-tp18947577p18947577.html

Attached is a patch file with a new method "createEnum". Not sure if this is the best approach, but with it, I can generate requests that contains enumerated restricted simple types.

Also in the patch is a JUnit4 java test.

Please note that the patch file also include patch for GROOVY-3204.