SciTools/iris — pull request #1376 by QuLogic (2014-10-09 01:06:54+00:00)
Title: Standardize Cartopy CRS imports.

The "Cartopy in a nutshell" notebook suggests as a standard:
```
import cartopy.crs as ccrs
```
which is implemented here.

There are other imports of `cartopy.`, but I did not change them.