Cleanup : removed duplicate parameter in web.xml

GCP-10175

Reviewer : Aldrin Batac
Modified pom.xml to support update of Spring version:
 - updated spring.version property
 - removed separate spring-asm and cglib dependencies (already embedded in 3.2.x)

 Updated gwt and Vaadin version number

GCP-10175

 Reviewer : Aldrin Batac
Update XMLs so that XSD version refers to one in updated Spring

GCP-10175

Reviewer : Aldrin Batac
Removed old widgetset artifacts / items
Added newly compiled widgetset items

GCP-10175

Reviewer : Aldrin Batac