WIP: refactor of read_nexrad_archive - 1
WIP: refactor of read_nexrad_archive - 2
WIP: refactor of read_nexrad_archive - 3
ENH: read_nexrad_archive returns a single radar object

* Gates/Moments not collected are masked in the returned object
WIP: read_nexrad_cdm refactor
DOC: updated dealias_fourdd documentation
MAINT: changed the default time_ordered parameter in read_sigmet to 'none'
DOC: updated INSTALL.TXT and README.TXT
DOC:typo in map_to_grid docstring
Merge pull request #93 from jjhelmus/master

Documentation and default parameter changes suggested by users
ENH: read_nexrad_cdm returns a single radar object

* Gates/Moments not collected are masked in the returned object
DOC: nexrad documentation
Merge branch 'nexrad_level2'
BUG: RadarDisplay titles for fields without standard_name attribute
ENH: pyart.test and pyart.test_verbose functions
BUG: multiple call to pyart.test() now pass
MAINT: submodule setup.py files corrected to include data/tests
DOC: renamed and updated INSTALL.rst and README.rst files
MAINT: fixed type in README.rst
Merge pull request #96 from jjhelmus/master

Better Reading of NEXRAD Level II file and other small bug fixes and changes