Replace dead link to nose website in install.rst

Hi, I noticed that the existing link (http://somethingaboutorange.com/mrl/projects/nose/) is dead, so I propose changing the link to https://nose.readthedocs.org, the first hit on a Google search for 'python nose'.

docs/source/install/install.rst

@@ -220,7 +220,7 @@ Another way of getting this is to do:
     $ pip install "ipython[test]"
 
 For more installation options, see the `nose website
-<http://somethingaboutorange.com/mrl/projects/nose/>`_.  
+<https://nose.readthedocs.org>`_.  
 
 Once you have nose installed, you can run IPython's test suite using the
 iptest command:
@@ -371,4 +371,4 @@ On other platforms, you can get pandoc from `their website <http://johnmacfarlan
 .. _jinja2: http://jinja.pocoo.org/
 .. _mistune: https://github.com/lepture/mistune
 .. _jsonschema: https://github.com/Julian/jsonschema
-.. _terminado: https://github.com/takluyver/terminado
+.. _terminado: https://github.com/takluyver/terminado