Work on updating parallel magic.

Work on default config files and docstrings. * Updated and documentated all the default config files. * Updated docstrings in launcher.py and clientconnector.py.

Work on engine/client reconnect logic.

Changed the INT then KILL delay to 2 s to be a little more friendly.

Added a log retrieval interface to Cluster.

Most of the new ipcluster is now working, including a nice client.

Removing old config directories that used the old config system.

Adding files for the refactored kernel scripts.

Lots more work on the kernel scripts.

Semi-working refactored ipcluster. This version uses the NotificationCenter, which I am not sure I like. But, it is important to see how all of this works.