Jug

* Fix bugs in shell subcommand and a few corner cases in encoding/decoding
results

* Changed execution loop to ensure that all tasks are checked (issue 33
on github)
* Fixed bug that made 'check' or 'sleep-until' slower than necessary
* Fixed jug on Windows (which does not support fsync on directories)
* Made Tasklets use slightly less memory

* 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'

* Python 3 compatibility fixes
* fsync(directory) in file backend
* Jug hooks (still mostly undocumented, but already enabling internal code
simplification)

* Renamed release candidate to final

* Adapt status output to terminal width (by Alex Ford)
* Add a newline at the end of lockfiles for file backend
* Add --cache-file option to specify file for ``status --cache``