Refactoring
Rename Helper to RedirectHelper
Print stacktrace for ConnectException/UnknownHostException
Add new URL shorteners and maskers.

Shorteners: htn.to, trib.al, mhlthm.ag, nerdi.st, pulse.me, y2u.be,
            feedproxy.google.com, mdk.to
Maskers: news.google.com, mandrillapp.com