Appfy.recipe.gae

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- Append any initialization options to the generated initialization output
(Josh Johnston)

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- Moved package to Github
- Moved from z3c.recipe.egg to zc.recipe.egg

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- Changed requirements::

zc.buildout >= 1.5.2
z3c.recipe.scripts >= 1.0.1
zc.recipe.egg >= 1.3.2

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- Readded option 'clear-destination' to the dowanlod recipe, true by default.
It was causing an error when the files existed, and 'ignore-existing' wasn't
avoiding it.

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- Scripts now extends z3c.recipe.scripts.scripts.Scripts, for better
compatibility with buildout 1.5.2.
- appfy.recipe.gae.sdk accepts a sha1sum option, to check the SDK checksum as
provided by Google.
- removed hexagonit.recipe.download as it was not flexible enough to allow
the sha1 checksum check.

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- Do not raise IOError when egg info is not found, and let installation
proceed only emitting a warning.