Merge pull request #116 from jjhelmus/master

ENH: plot method and various MAINT and updated EXAMPLES
Merge pull request #117 from jjhelmus/master

ENH: Support for reading Lassen files through RSL
Merge pull request #118 from jjhelmus/master

Miniconda based Travis-CI configuration
Merge pull request #120 from jjhelmus/master

ENH: pyproj no longer an optional dependency
Merge pull request #122 from jjhelmus/master

ENH: ARM time vars can be written with write_cfradial
Merge pull request #123 from jjhelmus/master

ENH: added _debug_info function.
Added RadarDisplayMap to allow the plotting of PPIs on basemap plots
Improved import so it will pass Travis CI and play nicer
+Add locations of all well-known WSR-88D stations. (Source: Weather Climate Toolkit)
+Add capability to read old nexrad-cdm archive. (Read lat,lon,alt from config)
*It is more reasonalbe to always set reference altitude to sea surface when mering multiple radars. (Change in grid_mapper.py)
MAINT: Renamed and placed RadarMapDisplay in own file.

* RadarDisplay map class renamed as RadarMapDisplay for consistency with
  GridMapDisplay
* Moved RadarMapDisplay class from the radar_display.py file to
  radarmapdisplay.py file which makes conditionally import simplier.
MAINT: renamed radar_display.py radardisplay.py
MAINT: refactor of RadarMapDisplay object

RadarMapDisplay parameters now more in line with a merging of RadarDisplay
and GridMapDisplay.
TST: unit tests for radarmapdisplay.py
MAINT: fixed typos in graph modules
DOC: documentation for RadarMapDisplay class
TST: skip radarmapdisplay test if basemap module not available
Merge pull request #1 from jjhelmus/pr_124

Refactor, unit test and documentation for RadarMapDisplay object
Merge pull request #124 from scollis/master

Added RadarDisplayMap to allow the plotting of PPIs on basemap plots
ENH: default configuration

Adding wind retrieval fields to the default configuration file. The bare
bones metadata for these fields are included: 'units', 'standard_name',
and 'long_name'.
ENH: location set when reading old NEXRAD files.

Reading CDM converted NEXRAD files which do not contain the
latitude, longitude and altitude will not fill these parameters
in from the known locations of the NEXRAD stations.