Add a limit to the number of connections made to irc servers

New configuration setting: conf.max_server_conns.

Limit is ignored if there is a WEBIRC password set for the server or if the server is running
in restricted mode.
Mergability with development branch
Also check ip_as_username config when applying per-server limit
Add (de)op/(de)voice/kick/ban options to nicklist menu
Show feedback when saving settings
Merge pull request #204 from M2Ys4U/feedback

Show feedback when saving settings
Merge pull request #203 from M2Ys4U/op_tools

Add (de)op/(de)voice/kick/ban options to nicklist menu
Connection limiting
Merge branch 'development' of github.com:prawnsalad/KiwiIRC into development
Only require socks.js if running node 0.10 or above
Merge branch 'socks' of https://github.com/M2Ys4U/KiwiIRC into development
Fix off-by-one error in checking node version
Merge branch 'socks' of https://github.com/M2Ys4U/KiwiIRC into development
ControlInput.addPluginIcon()
Filepicker client plugin