CF-125 Add PCOL_postcode_to_court_mapping.csv

Import postcode to court mappings. Add specs.

Tests work for postcode court lookup. Finish rake task for importing data.

CF-125 Fix bugs in postcode court search. Default to distance search when none found.

Show default copy on results page when exact possession court match is not found.

Remove TEST copy from homepage

Fix copy changes based on PR comments

Add new PCOL postcode courts data. Fix import rake task.
Look up Posession area of law by id instead of name

Fix possession search result copy

Fix possession area of law name on search results page
Add specs for Possession search
Change mailer url to courtfinder-test

Change mailer default url to use https instead of http

Set mailer default url host with env var instead of hard coded value.

Remove commented code line

Refactor search view and postcode importer
Check CSV values exist for postcode mappings before importing
Add validations on PostcodeCourt model
Search with like on lowercase of postcode instead of ilike for better performance.
Add possession type flag to areas of law