assets management improvements

(cherry picked from commit 9247c931dd504d4fdc11ac324386ab719bba22d1)

Conflicts:
	guvnor-asset-mgmt/guvnor-asset-mgmt-client/src/main/java/org/guvnor/asset/management/client/editors/repository/structure/RepositoryStructurePresenter.java
	guvnor-asset-mgmt/guvnor-asset-mgmt-client/src/main/java/org/guvnor/asset/management/client/editors/repository/wizard/CreateRepositoryWizard.java