add debug console to webapp

![screen shot 2014-11-24 at 12 36 40 pm](https://cloud.githubusercontent.com/assets/5429146/5172651/9bed47ae-73d6-11e4-98a2-873017f7e0b5.png)

* Added a debug console to webapp
* you can now inspect variables, call functions, and evaluate javascript in the context of your running program
It should work for the case that you are describing because it borrows the "scope" of the main interpreter. So changes to that scope will persist for as long as they would in that program.