Add Builder for PlaceRequest

New internal Builder class for PlaceRequest; most constructors as well
as with method have been deprecated in favor of new builder methods.
Package visible constructor has been made private and its usage in
RouteTokenFormatter adapted to usage of builder.
Implement CodeReview comments
Minor formatting changes
Updated GinUiBinder to work with GWT 2.5+

Added a case in CarStore to cover the feature.
Simplification of the gwt.xml files
CR changes
Resolved compile build error and simplified GWT pom config
Modification to service exception to log the full exception on the server side and clear the cause before sending back to the client