BUG: time ordering when reading sigmet files
Merge pull request #88 from jjhelmus/master

BUG: time ordering when reading sigmet files
ENH: Various command line tools.

The following command line tools are now available:

* anytocfradial: create a CF/Radial file from any radar file.
* radar_info: print out information about a radar file.
* radar_plot: create a plot for a radar file.
* check_cfradial: check that a file meets CF/Radial standards.

The main setup.py file updated to install the above scripts during install,
and PEP8 cleanup was performed on this file.
BUG: reading Sigmet file with data_type > 58.

Sigmet files which are truncated (end early) can also be read.
Closes issue #90
Merge pull request #89 from jjhelmus/master

ENH: Various command line tools.
ENH: read_sigmet will set sigmet_exteded_header metadata
MAINT: typo in sigmet.py docs
BUG: reading Sigmet files which are truncated in the middle of a sweep
BUG: reading Sigmet files with bad compression_codes
Merge pull request #91 from jjhelmus/master

BUG: read_sigmet related bug fixes
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