Dark theme, ctrl+s saves notebook, password protected servers, previous addresses in quick panel

A dark theme for the plugin, which is easier on the eyes IMO. It would require you to make a user settings file to allow switching between themes.

![image](https://f.cloud.github.com/assets/3216223/1314981/efe94c98-327f-11e3-8ee6-14b44b760954.png)