Z3c-relationfield

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* Updated test setup and test to run with current versions of dependent
packages, thus running with Python 2.6, too.

* Added missing (test) dependencies.

* Rename __neq__ method to __ne__ since __neq__ is not the right builtin
name for != handlers.

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* Fixes broken release.

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* Ensure that the value_type of a RelationList is not overwritten to be 'None'
when the field is constructed.

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* Move lxml and schema2xml dependencies to an [xml] extra so that people can
use this package without having to install lxml, which still causes issues
on some platforms. If z3c.schema2xml and lxml are not importable, the
relevant adapters will not be defined, but everything else will still work.

* Subscribe to IIntIdAddedEvent instead of IObjectAddedEvent to prevent
errors due to subscriber ordering.

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* Add missing dependency for lxml.

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* Prevent the event failures from failing when utilities are missing or when
objects do not implement IContained.