Implement airtable

[martingaston]

Updates:

• Add airtable API response for /api/:station/case/:id routes (including tests)
• Integrate airtable into component
• Add fetch-mock for RevisionPage.test.js to allow tests to pass in Node
• Add a test for removeHyphens for Codecov bonus.

[codecov-io]

Codecov Report

Merging #119 into master will increase coverage by 3.46%. The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master     #119      +/-   ##
==========================================
+ Coverage   90.78%   94.25%   +3.46%     
==========================================
  Files          11       13       +2     
  Lines          76       87      +11     
  Branches        5        7       +2     
==========================================
+ Hits           69       82      +13     
+ Misses          7        5       -2

Impacted Files	Coverage Δ
src/components/Pages/Revision/RevisionPage.js	80% <100%> (+2.22%)	:arrow_up:
src/utils/airtableReturns.js	100% <100%> (+42.85%)	:arrow_up:
src/app.js	97.36% <92.3%> (-2.64%)	:arrow_down:
src/utils/fetch.js	100% <0%> (ø)
src/utils/removeHyphens.js	100% <0%> (ø)

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