Extracted rest module builder
Added possibility to configure global header parameters.
Added possibility to configure global query parameters.
Merge branch 'master' of github.com:ArcBees/GWTP into cv_rest_global_header_params

Conflicts:
	gwtp-core/gwtp-dispatch-rest/src/main/java/com/gwtplatform/dispatch/rest/client/gin/RestDispatchAsyncModule.java
Tested global headers and queries
Removed Async Rest Param. Not necessary fr now
Added mvp-shared to the compound jar
Reduce fields visibility
Merge pull request #428 from ArcBees/cv_rest_global_header_params

Added customization methods for global Query and Header parameters