ref: 829d69d81f60d0a222bf5d1a38f78e07ae69dfeb sgx-jmp/test d---------
Add helper to fetch current BTC sell prices

Scrapes the sell price for Bitcoin from canadianbitcoins.com
USD price is done by converting this CAD sell price to USD via openexchangerates
Allow skipping tests without being caught in pry
Split logic out into testable objects

Rubocop clean. Good test coverage of helper objects.