Swapped ipython loading to use the piping command.

Also some code cleanup. Moving comments to appropriate place.
Removal of unused functions.
Added PBS support.
Added PBS documentation.
Merge branch 'master' of git://github.com/arq5x/gemini
Merge branch 'master' of git://github.com/arq5x/gemini
    Fixed restarting the cluster during loading.

    cluster is now started once, and the view to the cluster
    passed to the loading and recursive merge.
Replaced PBS support with Torque support.
Merge pull request #89 from roryk/master

IPython loading speedups