Plone.app.ldap

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- Fix GS import : _user_objclasses and _roles should not be imported as unicode strings
[gotcha]

- Update package dependencies.
[hvelarde]

- Update installation documentation.
[hvelarde]

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- Use ``.png`` file, not ``.gif``. Fixes ``KeyError:
confirm_icon.gif`` from
https://github.com/plone/plone.app.ldap/issues/11
[maurits]

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- Add Plone 4.3 compatibility, and break compatibility with Plone 4.0
and Plone 3, by not importing from zope.app anymore.
[maurits]

- Fix the exporter as GS 1.7 and higher now explicitly only
understands strings. Still works for older GS too.
[sneridagh]

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- Added a z3c.autoinclude entry point to mark this as a Plone add-on.
[WouterVH]

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- Expose the 'Read Only' attribute of LDAP plugins for modification with
plone.app.ldap (http://dev.plone.org/ticket/12292)
[kteague]

- Fix bug where changes to the Default User Roles option were being
discarded (http://dev.plone.org/ticket/12293)
[kteague]

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- Add Plone 4.1 compatibility when importing IVocabularyFactory.
[fvandijk]

- Include Products.CMFCore for Plone 4.1 compatibility.
[WouterVH]