Update GWT to 2.8.0-rc1 (lots of details below).Most of the items below were fixes for tests (whichare now production compiled by default) and dependencyissues (since gwt-user/gwt-dev now bring in transitivedependencies instead of bundling them in fat jars).* Upgrade jetty to version in ip-bom* Fix errai-bus test issues.* Remove GuardedBy and Nonnull annotations from errai-bus.* Fix javadoc bug in errai-bus.* Fix test failures caused by GWT type oracle behaviour change.(This commit causes the type oracle to hide non-abstract methodsin interfaces:https://github.com/gwtproject/gwt/commit/75382f1202bf3eaa399d60ebdba42bd7522da3bb)* Fix AbstractErraiTest so it is usable in errai-ioc-bus-support production compiled tests.* Fix data-binding tests (have to manually invoke event listeners because dispatchEvent does not work).* Fixes for errai-cdi-server tests (description below).* Upgrade Jetty version* Add -devMode gwt.arg* Add missing inherited modules(This was to try and get the tests to run in prod mode,but there appears to be a compiler bug that prevents this-- interned value is used before being referenced)* Use errai.devel.nocache property in Errai GWT generators.* Fix jaxrs-client bug with Date params.* Fix errai-ui tests (notes below).** Fix event dispatching issue (same problem as with data-binding tests).** Fix NPE when an empty input element fires a change event while boundto a primitive property in a model.* Fix errai-navigation native anchor test (same problem as data-binding tests).* Fix Errai Security tests.* Fix errai-jpa-client tests.* Fix gwt-dev version in demos.* Manage gson version in errai-bom to version required by gwt-dev.