Elex

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* Add version number back to log output (294)
* Restore exit code 64 for cached responses (302) and document caching (301)
* Fix csvkit compatibility (206)
* Add trend reports (299)

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* Fix :code:`__str__` methods (292)
* Fix bug related to parties in initialization data (293, 286)
* Add :code:`clear-cache` command to wipe http response cache (289)

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* Add reponse caching (121, 250)
* Enable gzip on http requests (273)
* Updated pinned requirements (279)

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Fixes a bug related to national / local flags on races. Running :code:`--local-only` would show all races as :code:`national=true` due to a Elex defaulting :code:`national` to :code:`true` but the AP drops the :code:`national` flag in the API results when the URL specifies :code:`national=false`.

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* Breaking change: Adds :code:`electwon` and :code:`electtotal` to :code:`CandidateReportingUnit` and :code:`electtotal` to :code:`ReportingUnit` to represent total electoral votes and number of electoral votes won. As these fields were not in previous releases, we've bumped to 2.1.x to indicate a breaking change to the schema.

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* Fixes a bug that makes :code:`reportingunitid` not-unique for national races, e.g., president. (278)