I'm back from haitus...  X11 is coming soon!  In the mean time, a few bug fixes (more on the way)...
Bookmarks plugin:  Fixed a bug where you could wind up with an empty/unusable bookmark if you created a new one without a protocol (i.e. it's missing ssh://, http://, telnet://, etc).  I've also added checks to ensure that it is impossible to create a bookmark with an invalid/empty URL or an empty name.
core/server.py:  Updated to use the new WebSocketClosedError exception in Tornado 3.2.