Plone-api

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New:

- update documentation links, we live in docs.plone.org/develop/plone.api now
[polyester]

Fixes:

- Fixed Plone 5 version comparison in tests.
[maurits]

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- Get email_charset value from the configuration registry, falling back
to portal property if not found.
[esteele]

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- Fixed `api.content.find` with combination of depth and path. Path
is no longer ignored then.
[maurits]

- Remove unittest2 dependency.
[gforcada]

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- Fixed long description of package to be valid restructured text,
displaying nicely on PyPI.
[maurits]

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- Symlink doctests so that they'll be included in the built egg and don't
break coredev builds.
[esteele]

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- Try to get use_email_as_login from registry first.
[pbauer]