swc-installation-test-2.py: Add minimum browser requirements for IPython

swc-installation-test-2.py: Add minimum browser requirements for IPython

IPython notebooks (at least for version 1.2.1 [1], 2.3.0 [2], and
3.0.0 [3]) have the following minimum browser requirements:

    Chrome ≥ 13
    Safari ≥ 5
    Firefox ≥ 6

Due to the notebook's usage of WebSockets and the flexible box model
[1,2,3].  This commit ensures that folks requiring IPython have a
notebook-compatible browser.

We don't actually check the Safari version, because I'm not sure what
the appropriate command-line switch is to get it to print version
information.

[1]: http://ipython.org/ipython-doc/1/install/install.html#browser-compatibility
[2]: http://ipython.org/ipython-doc/2/install/install.html#browser-compatibility
[3]: http://ipython.org/ipython-doc/dev/install/install.html#browser-compatibility