Cache filter and REST endpoint connection

Hello!!
This is New Year's Day pull request. I want to say my PF 2015 this way to everyone involved. 

This PR surpass formed Christmas PR: https://github.com/infinispan/infinispan-management-console/pull/2 and instead of cache filtering is adding an experimental UI for communicating with Infinispan REST server. 

Putting and getting entries to/from caches.

I've spent a couple of hours figuring out how to deal with/bypass same-origin-policy stuff. The simplest sollution (IMHO) is to use corsproxy locally. This experimental functionality can be used for testing, etc.