Collective.recipe.modwsgi

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* Do not make the recipe a subclass of zc.recipe.egg.Eggs but
use a local instance to determine the working set.
[wichert]

* Format the sys.path changes in the wrapper to make it more
human readable. This is purely cosmetic to help with debugging.
[wichert]

* Also recreate the wsgi wrapper file when updating a buildout part.
This is needed to get get changes to versions in the working set
(such as different version pins) reflected in the wrapper.
[wichert]

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* Call the Eggs constructor as well: working_set() needs too many of the
internal variables it sets for us to set them ourselves. This fixes
the recipe breaking when using find-links in buildout.
[wichert]

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* Initial release
[wichert]