LearnBoost/engine.io-client — pull request #288 by lpinca (2014-04-12 13:32:15+00:00)
Title: polling-jsonp: remove the script when the window is unloaded

Very similar to #283.
The patch ensures that no spurious error is emitted when the window is unloaded.

Fixes https://github.com/LearnBoost/engine.io/issues/247.