make importing of drawing and geo subpackages optional

diff -Naur networkx-networkx-1.10.orig/networkx/__init__.py networkx-networkx-1.10/networkx/__init__.py

--- networkx-networkx-1.10.orig/networkx/__init__.py	2015-10-30 15:41:35.000000000 -0600

+++ networkx-networkx-1.10/networkx/__init__.py	2015-11-24 09:34:20.741823392 -0700

@@ -95,5 +95,8 @@

 from networkx.linalg import *

 from networkx.tests.test import run as test

-import networkx.drawing

-from networkx.drawing import *

+try:

+    import networkx.drawing

+    from networkx.drawing import *

+except ImportError:

+    pass

diff -Naur networkx-networkx-1.10.orig/networkx/readwrite/__init__.py networkx-networkx-1.10/networkx/readwrite/__init__.py

--- networkx-networkx-1.10.orig/networkx/readwrite/__init__.py	2015-10-30 15:41:35.000000000 -0600

+++ networkx-networkx-1.10/networkx/readwrite/__init__.py	2015-11-24 09:34:46.539738141 -0700

@@ -14,4 +14,8 @@

 from networkx.readwrite.gml import *

 from networkx.readwrite.graphml import *

 from networkx.readwrite.gexf import *

-from networkx.readwrite.nx_shp import *

+

+try:

+    from networkx.readwrite.nx_shp import *

+except ImportError:

+    pass