Updated docs to reflect running tests from within python.

docs/source/detailed_installation.rst

@@ -96,7 +96,13 @@ Not currently supported.
 Testing
 '''''''
 
-If you wish to run the tests (strongly suggested :-), try the following
+If you wish to run the tests (strongly suggested :-), you can either run them
+from within python as follows ... ::
+
+    >>> import glymur
+    >>> glymur.runtests()
+
+or from the unix command line. ::
 
     $ cd /to/where/you/unpacked/glymur
     $ python -m unittest discover

docs/source/introduction.rst

@@ -70,3 +70,11 @@ to take advantage of it.  For example, if you install with pip's
 
     $ export PYTHONPATH=$HOME/.local/lib/python3.3/site-packages
     $ export PATH=$HOME/.local/bin:$PATH
+
+You can run the tests from within python as follows::
+
+    >>> import glymur
+    >>> glymur.runtests()
+
+Many tests are currently skipped; the important thing is whether or not any
+tests fail.