Luigi

This mainly features Python 3 support (thanks mostly to gpoulin!)

1.1.0 corresponds to 0abe27e5c6be616e107745b48dff8939815da73c and has been run internally at Spotify for a while so should be fairly robust.

I would have released latest master as 1.1.0 had it not been for the bugs around Tornado (824). Hoping to launch an 1.1.1 soon.

.24, .23, and .22 were quick fixes of big issues that came up when trying to release .21

Latest release

This is the same release as [0.10.0](https://github.com/pharmbio/sciluigi/releases/tag/0.10.0), while also fixing some problems with the build.

There were some conflicting libraries and unnecessary dependencies prohibiting SciLuigi from working with the latest Luigi 3.x branch.

This is now fixed, together with various cleanups and fixes in examples as well.