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PYTHON_VERSION="2.7" NOSE_ARGS="-v --no-skip --with-cov --cov pyart pyart" COVERALLS="true"

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jjhelmus 
Merge pull request #434 from jjhelmus/new_grid_layout

ENH: New Layout for Grid class

Introduce a new improved layout for the **Grid** class.  The new class has the following attributes:

* fields
* metadata
* time
* origin_latitude, origin_longitude, origin_altitude : specifying the geographic location of the grid origin
* x, y, z : specifying the regular Cartesian/cartographic distances from the grid origin.
* nx, ny, nz : the sizes of the three above dimensions.
* projection : specified the map projection used to transform between Cartesian and geographic coordinates.
* radar_latitude, radar_longitude, radar_altitude : Geographic location of the radar which were used to create the grid.
* radar_name, radar_time : Additional information about the radars which were used to create the grid.
* nradar : number of radar used to create the grid.

Additional the following attribute are lazily loaded upon first access of the 'data' key:

* point_x, point_y, point_z : Cartesian/cartographic location of all grid points.
* point_latitude, point_longitude, point_altitude : Geographic location of all grid point using the map projection specified by the *projection* attribute

The legacy *axes* attribute is still available but will be depreciated in future Py-ART versions.  

**Grid** objects are creating using a new set of parameters. Support for creating **Grid** objects using the legacy parameters is available using the `Grid.from_legacy_parameters` class method, which will be depreciated in future Py-ART versions.

The variables inside of the NetCDF files which Py-ART creates to store Grid objects have changed to match these new parameter names.  The `write_grid` and `read_grid` function use this new format.  The `read_legacy_grid` function is provide to read in NetCDF file using the older grid format, this function will be depreciated in future Py-ART versions.  

To further aid in the transition to the new Grid file layout, a **convert_legacy_grid** script is included with Py-ART which will create new style NetCDF files from the legacy NetCDF grid files.  This script does not make use of any functions inside Py-ART and should be usable regardless of if or what version of Py-ART is installed.

All code in Py-ART and examples have been update to use the new Grid layout and file format.

Finally the as the functionally of the `add_2d_latlon_axis` is now available in the *point_latitude* and *point_longitude* this function is depreciated and will be removed in future version of Py-ART.

Implements and closes #285

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Source Files on job 793.1 (PYTHON_VERSION="2.7" NOSE_ARGS="-v --no-skip --with-cov --cov pyart pyart" COVERALLS="true")