Adds basic functionality for getting Storm statistics at command line

Starts to address issue #17. Allows user to essentially recreate storm UI index page and topology detail page at the command line (configuration details omitted for brevity at this point). 

User can run `streamparse -e ENV` to get storm-ui-index-page-like results. User can also add `-n TOPO_NAME` to get topology-detail-page-like-results.

Main problems at the moment:
* Slow to load results, probably because I'm creating multiple SSH tunnels. 
* Prints wide tables that will wrap in terminal windows.
* Doesn't live-refresh (e.g. with [curses](https://docs.python.org/2/library/curses.html)).
Ah, yup. I was guessing that indicated the topology was optional.