Templatizing environment-specific variables in JS.
Fixing typo.
Tryign double quotes to prevent HTML entity encoding.
Revert "Tryign double quotes to prevent HTML entity encoding."

This reverts commit 656c393aaa66e558179ad94f08812bd3c931b690.
Disabling default escaping.
Making redirect URLs absolute so they work well with router.
Removing extra leading /.
Pass OAuth callback URI through sign-in link so it works well with router.
Fixing syntax error.
Templatizing Twitter OAuth callback URI so it comes from a single source of truth.
Distinguishing between relative URLs, absolute URLs and reserved relative URLs for twitter sign-in.
Fixing object instantiation in OAuth callback request handler.
Fixing inconsistent "constant" name.
[#345] Communicating errors back to client via URL instead of query param.
[#290] Redirect to /error/twitter-access-denied if user cancels Twitter auth.
More logging.
Fixing host header handling.
Testing domain issue with requests to API.
Revert "Testing domain issue with requests to API."

This reverts commit 1f706d227451535688524c51b7cb09ff651d17f7.
Trailing semicolons. KHAAAAAAAN.