Add initial spark mustache example assets

* Runs, displays the template page at least.
Add feature completeness

* Brutal and raw 'make-it-work' implementation, and I must say
  this was a great experience. Can't believe that it can be that
  pragmatic to work with Java. Will try to do some refactoring
  in order to be more model-driven, type-safe and such - but
  this was _fun_!