superset of attrs

uttr now have the decorator uttr.s with the same behavior as attr.s but also add the array accessor automatically.
Another new feature is the capability of uttr.ib() to accept unit=None.

0.4.1

This version is almost the same as 0.4, but fix a minor and annoying typo that prevents the correct build on PyPI

0.4

More velocity on internal cohesion and conversion of array_accessors.

0.3

Now uttr.ArrayAccessor is not an attrs class. This prevents some bad behavior with the attrs helper funcions

0.2

This version implements a more strict version of array_accessor()

If you try to access an attribute no defined by uttrs, an AttributeErrror is raised.

0.0.1

Bugfix, now a None as default is working

First public version

This version provides the basic functionalities to use astropy units with attrs based classes.