Changes to loading_iris_cubes.rst, copied from PR.212
Abbreviated numpy namespace

All modules now use:
    import numpy as np
Abbreviated masked array namespace

All modules now use:
    import numpy.ma as ma
Numpy namespace abbreviations in documentation
Numpy namespace abbreviations in test code
human readable datetimes and cube unit printout
Merge pull request #338 from ajdawson/numpy-namespace

Standardising numpy namespaces
Merge pull request #323 from cpelley/print_units

Improved str() support: Cube units, and human-readable dates.
Further changes to loading_iris_cubes.rst.
empty file handing
Merge pull request #173 from bblay/mtfile

Empty file handing
Merge pull request #265 from pp-mo/old_doc_changes_3_docs_cubeload

Changes to loading_iris_cubes.rst, copied from PR.212
g1 duplicate rule
Merge pull request #180 from bblay/g1dup

GRIB1 duplicate rule
Added CF variable name attribute to cubes and coords.
Added var_name argument to cube.aux_factory() method.
Added is_compatible methods.