Initialized sinatra dependencies in Gemfile
Added stub bitcoin api endpoint using sinatra
Hooked up firebase client and modified endpoint to return result of open-data/cryptocurrencies
Changed format of json response to match spec
Hooked up sqlite and activerecord, and created initial migration for creating bitcoin_rate_requests table in the database
Updated bitcoin rates endpoint to log the request to sqlite database
Tweaked json response of endpoint to come from the database object instead of the firebase response