Accepting 'throw' as variable name

[Christian Kleineidam]

In python it's possible to call a variable throw. Unfortunately it's a reserved word in Javascript, so the code that calls a variable throw crashes. Given that the parser should get valid python code to run I suggest that it renames I valid python variables names like throw that are invalid Javascript variable names into throw1345 or something similar.

[Nick Winter]

Fixed with @basicer's new Esper interpreter.