Rename 'host' to 'hostname' in whois client event

Fixes #511
Remove unused require('util') from server/irc/user.js
Fix indentation in server/irc/user.js
Upgrade font-awesome to 4.1.0
Merge pull request #545 from M2Ys4U/font-awesome

Upgrade font-awesome to 4.1.0
Fixed additional host -> hostname
Merge pull request #544 from M2Ys4U/whois-host

Rename 'host' to 'hostname' in whois client event