pinning to networkx 1.11... 2.0 breaks things

README.rst

@@ -61,7 +61,7 @@ installing viz dependencies, if they so choose.
 
    .. code:: 
 
-      pip install .[viz]
+      pip install postman_problems[viz]
 
 
 2. Install Graphviz.  You need this underlying software application in addition to the `graphviz python package`_ which
@@ -263,21 +263,20 @@ Developers
 ==========
 
 If you'd like to fork or contribute directly to this project (PRs welcome), or simply want run the tests, here's how:
-
-1. Install test dependencies.
+
+0. Clone/Fork repo
+
+1. Full install with test and viz dependencies.
 
    .. code::
     
-       pip install .[test]
-       pip install .[viz]
+       pip install .[test,viz]
    
    Or do an editable install from the beginning.  This is my typical approach when developing.
 
    .. code::
     
-      pip install -e .
-      pip install -e .[viz]
-      pip install -e .[test] 
+      pip install -e .[test,viz]
  
 2. 
 

setup.py

@@ -47,7 +47,7 @@ def read(fname):
     python_requires='>=2.7',
     install_requires=[
         'pandas',
-        'networkx'
+        'networkx==1.11'
     ],
     extras_require={
         'viz': ['imageio', 'matplotlib', 'graphviz', 'tqdm'],