Remove Modules.override from GuiceBundle

Updated the GuiceBundle and JerseyContainerModule
so that JerseyContainerModule no longer relies on Modules.override
to swap the Dropwizard WebApplication for the standard
Jersey one. Using Modules.override prevents other ServletModules
from being installed in the DI container.
Merge pull request #10 from jonbca/master

Remove Modules.override to allow other ServletModules to be installed in the injector