Merge pull request #62 from jjhelmus/master

ENH: Restructed Radar object
Merge pull request #63 from jjhelmus/master

read function,  better CF/Radial support, script to check CF/Radial compliance
Merge pull request #65 from jjhelmus/master

BUG: fixed bug in unfoldVolume.c

Will require recompiling of _fourdd_interface module.  From within the pyart/correct directory remove the _fourdd_interface.so file, then execute python setup.py build_ext -i
Merge pull request #66 from jjhelmus/master

MAINT: np.ma.empty call for older numpy versions
Merge pull request #68 from jjhelmus/master

ENH: Reading of Sigmet/IRIS files
Merge pull request #69 from jjhelmus/master

TST: Unit Tests

Proper unit tests for Py-ART which use nose (https://nose.readthedocs.org/en/latest/)

To run the unit tests use:
nosetest
Merge pull request #71 from jjhelmus/master

Additional unit tests and removed use of OrderedDict
Merge pull request #72 from jjhelmus/master

ENH: Continuous Integration (Travis CI)
Merge pull request #76 from jjhelmus/master

ENH: Reading of NEXRAD Level II data
BUG: added testing submode to pyart/setupy.py file