add campaign contributions to person detail

[derekeder]

Adds a searchable table of campaign contributions to each Alder on their detail page.

This PR includes:

• adds table and section to Alder detail page
• adds candidate_id from IL Board of Elections for each Alder
• stores Alder metadata in a CSV and loads it in via a cached function in utils.py
• updates ChicagoPerson model code to access new metadata
• adds text and link to Illinois Sunshine page under Campaign Donations section
• pins version of django-haystack[elasticsearch] to v3.2.1 to handle a recently introduced build error
• removes opencivicdata 3.2 dependency. no longer needed as that feature has been merged in

Testing

• visit several alder pages. confirm they have a new tab to click on for Campaign Donations
• browse, search, filter the table to confirm the data looks right
• Alders without a candidate id, like the Mayor, should not show that table

[derekeder]

gettin somewhere!

[derekeder]

Created a Google Sheet with alder metadata that I can export https://docs.google.com/spreadsheets/d/1f2hbjnvkqD6QYjjPZ4yxBunLS9k7t2Y1cyCP9E9V4ns/edit#gid=0

[fgregg]

i think we should be handling this a management command instead of loading the file in each time, but it's an improvement of the status quo.