Version 1.4

New UVData methods for frequently requested improvements:
fast_concat: much faster concatenation of objects along a specified axis
reorder_blts: reorder visibilities along the baseline-time axis
conjugate_bls: conjugate visibilities to follow a range of conventions

Many improvements to UVBeam interpolations.
Support for CST yaml settings files to specify metadata associated with CST simulated beams.

Better x_orientation support throughout the package (Classes, methods, functions)

Testing based on pytest rather than the unsupported nose package.

Many other new features, bug fixes, documentation improvements. For full detail see the CHANGELOG.