Added documentation to the doctests.py

Added Numpy Style documentation to the file, and a small side-note about the ELLIPSIS option from doctest online documentation.

Author: Inviro

doctests.py

@@ -6,11 +6,27 @@
 
 # Note loader and ignore are required arguments for unittest even if unused.
 def load_tests(loader, tests, ignore):
+    """
+        Locates and returns a collection of unittests in a TestSuite object
+        Parameters
+        ----------
+        loader :
+            A required but unused parameter.
+        tests :
+            A unittest TestSuite object for collecting the needed test cases.
+        ignore :
+            A required but unused parameter.
+        Returns
+        -------
+        tests :
+            A unittest TestSuite object that holds test cases.
+    """
     for root, dirs, files in os.walk("."):
         for f in files:
             if f.endswith(".rst"):
                 tests.addTests(
                     doctest.DocFileSuite(
+                        # ELLIPSIS option tells doctest to ignore portions of the verification value.
                         os.path.join(root, f), optionflags=doctest.ELLIPSIS
                     )
                 )