Elementpath

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* Remove Python 2 support
* Add TextNode node type
* Fix for issue 15 and for errors related to PR 16

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* Fix 'attribute' multi-role token (axis and kind test)
* Fixes for issues 13 and 14

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* Add token labels 'sequence types' and 'kind test' for callables that are not XPath functions
* Add missing XPath 2.0 functions
* Fix for issue 12

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* Add test module for TDOP parser
* Fix for issue 10

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* Improved schema proxy
* Improved XSD type matching using paths
* Cached parent path for XPathContext (only Python 3)
* Improve typed selection with TypedAttribute and TypedElement named-tuples
* Add iter_results to XPathContext
* Remove XMLSchemaProxy from package
* Fix descendant shortcut operator '//'
* Fix text() function
* Fix typed select of '(name)' token
* Fix 24-hour time for DateTime

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* Hashable XSD datatypes classes
* Fix Duration types comparison