Handle when components are defined inside topology module

[dan-blanchard]

I recently rediscovered that you cannot define a Bolt or Spout inside a topology module, because the topology module does not get packaged up with the the rest of the code. The error message you get is really cryptic, because the Storm workers will crash when launching the process telling you the topology module cannot be found. We should either explicitly detect and disallow this behavior, or add the topology file to the JAR that gets created. (Personally, I think adding the Python file to the JAR would be difficult, because the import paths in the topology module itself are unlikely to still work.)