Dependecy critical bug with mime since 2.0

[UlisesGascon]

Hi team!

There is a bug with mime dependency. There is a breaking change for lookup method since version 2.0. I will check this bug asap and see if I can perform a PR to fix it ;-)

.../node_modules/pillars/lib/Gangway.js:451
    var ct = mime.lookup(clientname);
                  ^

TypeError: mime.lookup is not a function
    at fileStream (.../node_modules/pillars/lib/Gangway.js:451:19)
    at Gzip.cb (../node_modules/pillars/lib/Gangway.js:419:17)
    at Gzip.zlibBufferOnEnd (zlib.js:124:10)
    at Gzip.emit (events.js:187:15)
    at endReadableNT (_stream_readable.js:1098:12)
    at process.internalTickCallback (internal/process/next_tick.js:72:19)