Fixed overzealous initialization of PYTHONPATH.

Review Request #4027 — Created April 7, 2013 and submitted — Latest diff uploaded

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This is a bugfix over __init__.py that was inititalliy changed at https://github.com/reviewboard/reviewboard/commit/915452d483a812ee34006741a6f5c23a4d03a5b1

The current initialization is overzealous and conflicts with the installation call from extensionbrowser's easy_install usage (with the current initialization, an easy_install call would nuke all entries in the easy_install.pth file and overwrite previous entries).