Django-scim2

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- Refactor location of ATTR_MAP, placed in filters.py
- Fixed NameError
- Add testing around complex queries
- Upgrade dependency: scim2-filter-parser -> 0.2.2

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- Refactor ComplexAttrPaths to use custom class

This changes the API for PATCH handlers.
Handlers will take a 3-tuple as before and now, additionally,
a ComplexAttrPath object that contains information regarding
the complex path. Handlers look for this object to determine
if they need to perform extra handling to determine the attribute
that needs to be updated

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- Upgrade dependency: scim2-filter-parser -> 0.2.1

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- Upgrade dependency: scim2-filter-parser -> 0.2.0

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- Retain capitalization in filter queries
- Add tests

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- Add AuthorizationError to exceptions