Buildout-helpers

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- Mostly refactor freeze command. Still hard to read and needs more love.
[do3cc]

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- Add freeze command, downloads all external buildout files, with
headers that allow the same freeze command to update it.
[do3cc]

- Add version info command that show which buildout file pins which
version. Inspired from jensens script
[do3cc]

- Rename package to buildout_helpers. Namespace packages cause trobule
with pip and buildout
[do3cc]

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- Mr.developer variables in buildout sections are now separated
and at the end of the buildout section
[do3cc]

- Sources sections are at the end now
[do3cc]

- Multiline options do not need an indent of 4 spaces, one is enough.
Now this script correctly identifies them
[do3cc]

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- Support piping.
[do3cc]

- Remove unneeded dependency.
[do3cc]

- Fix 3 bugs resulting in bad buildout.cfgs.
[do3cc]

----------------

- Initial release.
[do3cc]