Legislice

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- fix bug: Client made API request requiring 301 redirect

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- add Citation class
- add Citation Style Language JSON serializer methods
- remove mock Clients by migrating tests to pytest-vcr

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- order fields in serialized Enactment JSON output format for readability
- remove include_start and include_end from serialized Enactment JSON output
- fix bug: Enactment.select_all created zero length selectors

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- add CrossReference class as memo of cited Enactment to download
- add CitingProvisionLocation as memo of citing Enactment to download
- add cross_references attr to Enactment model
- add citations_to method to Client class
- EnactmentSchema's content field is moved to a new nested model called TextVersionSchema
- add ability to pass CitingProvisionLocation to Client.read
- add ability to pass InboundReference to Client.read

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- don't add ellipsis to selected_text for node with no text
- accept list of strings to generate anchorpoint TextPositionSet
- combine selected text passages within 3 characters of each other

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- initial release