Xmlschema

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* Fix path normalization and tests for Windows platform
* Added XML resource validation in lazy mode (experimental feature)
* Added arguments *filler* and *fill_missing* to XSD decode/encode methods
* Added arguments *preserve_root*, *strip_namespaces*, *force_dict* and *force_list* to XMLSchemaConverter
* Added code coverage and pep8 testing
* Drop support for Python 3.4

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* Added a script for running the W3C XSD test suite.
* Check restrictions and model groups UPA violations
* Model groups splitted between two modules for more focusing on models basics
* Added two new exceptions for model group errors
* More control on imported namespaces
* Added *use_meta* argument to schema classes
* Added *includes* list and *imports* dict to schema classes
* Many fixes for passing the W3C's tests for XSD 1.0 schemas
* Added a test for issue 105 and a fix for issue 103

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* Fixed Element type mismatch issue when apply *SafeXMLParser* to schema resources
* More XSD 1.1 features implemented (open content and versioning namespace are missing)

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* Programmatic import of ElementTree for avoid module mismatches
* Cleaning and refactoring of test scripts

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* Dependency *defusedxml* package replaced by a custom XMLParser for ElementTree
* Optional decoding of XSD date/time/duration builtin types
* Fixes for issues 93, 96, 97 and 99

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* Fixes for issues 87 and 88
* Merged with PR 89 (simpleType restriction annotation parsing)
* XSD 1.1 development: added assertion facet (still to be completed)