Finished generating ipython notebook and incorporating in to docs

docs/source/pythonapi/examples/mgxs-part-iv.rst

@@ -0,0 +1,13 @@
+.. _notebook_mgxs_part_iv:
+
+====================================================
+MGXS Part IV: Multi-Group Mode Cross-Section Library
+====================================================
+
+.. only:: html
+
+    .. notebook:: mgxs-part-iv.ipynb
+
+.. only:: latex
+
+    IPython notebooks must be viewed in the online HTML documentation.

docs/source/pythonapi/index.rst

@@ -26,6 +26,7 @@ Example Jupyter Notebooks
     examples/mgxs-part-i
     examples/mgxs-part-ii
     examples/mgxs-part-iii
+    examples/mgxs-part-iv
 
 ------------------------------------
 :mod:`openmc` -- Basic Functionality

openmc/summary.py

@@ -41,6 +41,7 @@ class Summary(object):
         self._read_nuclides()
         self._read_geometry()
         self._read_tallies()
+        self._f.close()
 
     @property
     def openmc_geometry(self):