Transition to Popolo format

[jpmckinney]

Must rewrite:

• ★ represent-canada-csv-proxy: merge into scrapers_ca_app (make like CSVScraper)
• ★ represent-canada-popolo-proxy: merge into scrapers_ca_app (make like CSVScraper)
• represent-canada: merge into scrapers_ca_app? #84 (use Imago instead of represent-reps)
• represent-postcodes: replace represent-reps usage

Can eliminate:

• represent-reps
• scrapers_ca_app's represent view

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Must rewrite API clients to use Imago API:

• govkit-ca
• jquery-findyourrep-ca
• represent (Drupal)
• represent-api (WordPress)

Must rewrite API client usage:

• represent-canada-images: uses govkit-ca
• webform_represent (Drupal): uses represent

[jpmckinney]

Having written this out, this is likely too much trouble - not even considering the transition costs for users. Would need to phase out deprecated APIs over 1-2 years, or transition to representapi.com.

Note that if transitioning to representapi.com, it may be an opportunity to go HTTPS-only (more advice from Eric Mill).

The tasks with a ★ can be performed without a major overhaul.

[jpmckinney]

If I remember correctly, popolo-proxy is only used for Montreal, and CSV proxy is only used for Google Sheets maintained by third-parties. Neither have contributed to maintenance costs (they just work). If we ever do need to update them, we might consider merging them into scrapers_ca_app at that time. I added a note to their readmes.