GitHub issue #11: Nevow should handle interrupted HTTP responses.
Add docstring for test_connectionLost.
Document _lostConnection.
Clean up finishRequest a bit.
Explain what `_cbFinishRender` is doing.
Add a comment to this new block.
Adjust the docstring format to the preferred.
Make an assertion in this test.
Expand some names for readability.  Remove the unnecessary path assignment.
Move the new import to the top of the module.
Merge pull request #44 from exarkun/interrupted-response-11

Avoid trying to send a response if the connection is lost before we are ready to do so.

This avoids triggering an error from more recent versions of Twisted Web which consider writing the response body after the connection is lost to be invalid.

Author: pmw, exarkun
Reviewer: exarkun, glyph