IRIS cartopy needs pyshp ?

[darkblueb]

## from the example docs
import cartopy.crs as ccrs

--------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-762e43a32730> in <module>()
----> 1 import cartopy.crs as ccrs

/usr/local/lib/python2.7/dist-packages/cartopy/__init__.pyc in <module>()
    108 # convenience.
    109 import cartopy.crs
--> 110 import cartopy.feature

/usr/local/lib/python2.7/dist-packages/cartopy/feature.py in <module>()
     27 import six
     28 
---> 29 import cartopy.io.shapereader as shapereader
     30 import cartopy.crs
     31 

/usr/local/lib/python2.7/dist-packages/cartopy/io/shapereader.py in <module>()
     47 
     48 from shapely.geometry import MultiLineString, MultiPolygon, Point, Polygon
---> 49 import shapefile
     50 import six
     51 

ImportError: No module named shapefile

[darkblueb]

added python-pyshp in rev 11532