Basic subtitution of SOFA by ERFA
Fix #1130: Scale and format attributes were not listed in dir()
Remove further references to SOFA, now in docs
Updated changelog
Updated the last iau prefixed function
Add import statement for Table.
Remove sys.stdout

`sys.stdout` is the default. There is no need to explicitly put this.
Adds rudimentary __str__ and __repr__ representations for NDData objects.
Low-hanging fruit optimization in the initializer of Angle
ERFA change message moved, minor grammar tweak
Using the full permission text
In 0.2 we are using SOFA, not ERFA
Merge branch 'master' into erfa

Conflicts:
	CHANGES.rst
Longer explanation of the SOFA -> ERFA change
Tiny fix to testguide

minor formatting issue
Merge pull request #1293 from sergiopasra/erfa

Change SOFA to ERFA
Merge pull request #1334 from keflavich/patch-1

Tiny fix to testguide
Moved common code that converts input to an array to a function. Added a check for fittable models in .
Merge pull request #1130 from mdboom/time/make-dir-work

Scale and format attributes are not seen in dir()
Warn when a VOTable 1.2 file contains no RESOURCEs