Added custom quit message functionality. Resolves erming/shout#71
Added chat clear keybinding.
Added Unix-like chat clear keybindings. Now only clears the chat if the main input is focused.
Added '/clear' command
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Custom scrollbar in the sidebar
Sort by z-index on close
Added 'Send' button
Added 'Close' button
Server-side tracking of new message count
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Minor fix
Minor fixes
Set cookie expiration date
Use <div> instead of <button> in sidebar
Fix focus
Sortable sidebar (experimental)
Add username field to user info.

Most of the networks don't allow unicode username. This patch allows users to specify username optionally. When specified, username is used for connecting IRC networks instead of nickname.
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