Webapp integration

Integrate webapp into dashboard (create Game, add one level to editCode script, associated loc strings)

Add a new 'ec_simple' editCode level to webapp.

Modify webapp and (codegen.js) to allow webapp to use JSInterpreter for its editCode levels.

The functionFromCode() function - which returns a new native function doesn't make sense in the editCode world (because we assume that the app will be using JSInterpreter).