STORM-205. Add REST API to Storm UI.

1) removed html rendering from core.clj
2) added RESTful apis to core.clj
3) moved html rendering to jquery & mustache on top of newly added restful apis
4) added api
   1) /api/cluster/configuration
   2) /api/cluster/summary
   3) /api/supervisor/summary
   4) /api/topology/summary
   5) /api/topology/:id
   6) /api/topology/:id/component/:component
   7) /api/topology/:id/activate (POST)
   8) /api/topology/:id/deactivate (POST)
   9) /api/topology/:id/rebalance/:wait-time (POST)
   10) /api/topology/:id/kill/:wait-time (POST)
 all of the above methods returns json response.