Elementpath

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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

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* Added special XSD datatypes
* Better handling of schema contexts
* Added validators for numeric types
* Fixed function conversion rules
* Fixed tests with lxml and XPath 1.0
* Added tests for uncovered code

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* Added code coverage and flake8 checks
* Drop Python 3.4 support
* Use more specific XPath errors for functions and namespace resolving
* Fix for issue 4