pom.xml(maven-license-plugin): check also *.groovy sources.
Updated year in copyright.

Mostly done with mvn license:format.

No functional changes.
Replace usage of commons-upload library by functionality from Servlet 3.0 API.

@see http://docs.spring.io/spring-framework/docs/current/spring-framework-reference/html/mvc.html#mvc-multipart-resolver-standard
@see http://docs.oracle.com/javaee/6/tutorial/doc/gmhal.html

No functional changes.