Initialized the plugin
Added initial version of the main marshaller code from another project.
Upgraded to newer Grails due to GRAILS-10183
Adding a bunch of files that Grails has created after the first run-app
Registering custom marshallers in BootStrap.groovy

This code should really be placed somewhere in the plugin and set to run
automatically, but the bootstrap method will have to do for now.
Added the Hibernate plugin so we can have some test domain data.
Added & populated a couple of domain classes for demo purposes
Added a controller & view to demo the plugin's purpose
Included the HTML generated by our demo controller into git for easier demonstration