Fix test failures in pull request #262

[slarson]

Trying to integrate #262 into the dev branch. We are running into the following test failures:

• DataIntegrityTest.test_neuron_GJ_degree() returns the wrong value
• DataIntegrityTest.test_neuron_Syn_degree() returns the wrong value
• Within the documentation tests, the following lines of the README are raising similar errors on lines 54, 116, and 197.

Full output below:

=================================== FAILURES ===================================
___________________ DataIntegrityTest.test_neuron_GJ_degree ____________________
self = <tests.DataIntegrityTest.DataIntegrityTest testMethod=test_neuron_GJ_degree>
    def test_neuron_GJ_degree(self):
        """ Get the number of gap junctions from a networkx representation """
>       self.assertEqual(PyOpenWorm.Neuron(name='AVAL').GJ_degree(), 81)
E       AssertionError: 44 != 81
tests/DataIntegrityTest.py:136: AssertionError
___________________ DataIntegrityTest.test_neuron_Syn_degree ___________________
self = <tests.DataIntegrityTest.DataIntegrityTest testMethod=test_neuron_Syn_degree>
    def test_neuron_Syn_degree(self):
        """ Get the number of chemical synapses from a networkx representation """
>       self.assertEqual(PyOpenWorm.Neuron(name='AVAL').Syn_degree(), 187)
E       AssertionError: 105 != 187
tests/DataIntegrityTest.py:140: AssertionError
________________________ DocumentationTest.test_readme _________________________
self = <tests.DocumentationTest.DocumentationTest testMethod=test_readme>
    def test_readme(self):
        [failure_count, return_count] = doctest.testfile("../README.md")
>       self.assertEqual(failure_count, 0)
E       AssertionError: 3 != 0
tests/DocumentationTest.py:25: AssertionError
----------------------------- Captured stdout call -----------------------------
**********************************************************************
File "/home/travis/build/openworm/PyOpenWorm/tests/../README.md", line 54, in README.md
Failed example:
    aval.connection.count('pre')
Expected:
    157
Got:
    86
**********************************************************************
File "/home/travis/build/openworm/PyOpenWorm/tests/../README.md", line 116, in README.md
Failed example:
    aval.Syn_degree()
Expected:
    187
Got:
    105
**********************************************************************
File "/home/travis/build/openworm/PyOpenWorm/tests/../README.md", line 197, in README.md
Failed example:
    len(innervates_mdr21)
Expected:
    4
Got:
    0
**********************************************************************
1 items had failures:
   3 of  35 in README.md
***Test Failed*** 3 failures.

[slarson]

Just merged #262 so this is closed