Deprecate LogUtil and redirect it's messages to slf4j logger.
Replace framework calls from LogUtil to gwt-slf4j.
Switch ManagementConsole to gwt-slf4j.
Add custom logging handlers, using a global format string (like
java.util.Logging)

Notable changes:
* Add Logging module to ErraiCommon
* Add four handlers (extending gwt-builtin handlers)
* Add ErraiSimpleFormatter (based on the java.util SimpleFormatter)
* Add StingFormat utility (emulating String#format(String, Object...))
* Add class for configuring handler log levels at runtime
Prevent log handler log levels from being overwritten by superclass
constructors.
Change signature of getHandler method to avoid caller having to cast return value.
Modify JBossLauncher http port while copying xml file.

This removes the need to restart the server (noticeably reducing the
start-up time).
Add test for hibernate entity scanning disablement
Added Eclipse m2e exclusion for unknown GWT plugin execution
Allow for the use of different callback types in JAX-RS interceptors and actual call sites
Removed JettyLauncher from demo setup (no longer needed)
change ordering of generated methods in jaxrs proxies to improve readability
Add test for RPC call with proxied return value (from hibernate entity manager).
Marshaler fix: use static marshaler for parent class if class was generated by javassist.
now also works for less files with imports
Merge pull request #76 from edewit/less

now also works for less files with imports
fixed tests
Fixed ERRAI-681: NPE when binding null List field to ListWidget
Initial work on ERRAI-621: incremental marshaller generation
Removed unnecessary debug output