* Use HIGHEST_PROTOCOL when pickle()ing
* Add compress_numpy option to file_store
* Add register_hook_once function
* Optimize case when most (or all) tasks are already run
* Add --short option to 'jug status' and 'jug execute'
* Fix bug with dictionary order in kwargs (fix by Andreas Sorge)
* Fix ipython colors (fix by Andreas Sorge)
* Sort tasks in 'jug status'