Add url whitelist & blacklist

* Simple regex patterns for disabling logging of requests to specified
hosts
* Blacklist overrides whitelist
Add new whitelist/blacklist options to readme
Add ethon adapter support
Add excon adapter support for whitelist/blacklist patterns
Fix bundler warning about rubygems source (non-https)
Add httpclient adapter support for whitelist/blacklist patterns
Add patron adapter support for whitelist/blacklist patterns
Fix pattern matching for blacklist/whitelist when url is not a string
Add simplecov
Fix Faraday test adapter to actually use Faraday for POSTing
Fix status code symbols from breaking regex tests
Add helper methods to test adapters
Constantize log prefix
Fix Net::HTTP url approval
Use dynamic tests to test all adapters consistently
switched rubygems source to https
Merge branch 'master' of github.com:andrhamm/httplog into andrhamm-master
fixed logging of URL, status
fixed logging of URL, status
logging request type in compact mode