New styling

[louisstow]

I merged in your changes and added quite a bit of styling.

• Instead of a random color, it chooses from a list (so we have more control)
• When disconnecting from a server, it will remove all the nodes for each channel on that host
• Created a cache object of clients so we don't create a new one for each host
• Used some styles from the mozilla style guide
• Made each tab adopt the background color
• Added some distinction between status messages, your own message and other people's messages
• Clicking on a host in the host list will put it in the input box to easily join other channels in that host
• The username field no longer will get cleared

You may want to just checkout this branch and try it out to see the changes.

[louisstow]

Btw, I've noticed a bug where it will try join a channel twice. Wondering if the join callback is being executed twice.

[nickdesaulniers]

This looks great!

[nickdesaulniers]

@louisstow , I'm unable to repro the issue with channels being joined twice. I'm going to bring the submodule back up to speed. If I don't find it by the end of the day, would you mind opening an issue with STR?