Rios.core

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* Changed license to Apache v2.
* Updated URI validation to avoid problems with buggy version of ``colander``.
* Added validation of Assessment values against ``length``, ``range``, and
``pattern`` constraints.

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* YAML serialization fixes due to new versions of PyYAML.

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* PY3K fixes.

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* Fixed inconsistencies with how "required" is enforced with matrix rows and
columns.

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* Added validation logic to prevent the assignment of the standard widget types
to fields of incompatible data types.
* Added validation logic to prevent unknown properties in Instrument
Enumeration definitions.
* Updated ``colander`` dependency to allow more recent versions.

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* Added support for the ``identifiable`` flag on Calculations.
* Added support for the ``meta`` property in Instruments, Calculation Sets,
Forms, and Interactions.
* Enhanced validation of metadata values that are supposed to follow the HTTP
Product Token format.
* Display duplicate IDs and more information in error messages.
* The ``get_full_type_definition()`` function is now officially part of the
public API of this package.