swc-installation-test-2.py: Add ipython (script) >= 0.13

And make sure the IPython package has the same minimum version.
IPython 0.12 can't display more recent notebooks.
swc-installation-test-2.py: Handle unparsable versions gracefully

This avoids raising NotImplementedError from my IPython 0.14.dev.  We
don't want to have to start ranking alpha, beta, dev, r6, etc., so
just print the unparsable version and minimum version, and leave it to
the student to decide if their version satisfies the condition.  It's
unlikely that students have such pre-/post-release software installed
anyway.