Adding Header For IPython Notebook in Bootstrap 3 Theme

jakevdp had converted Pelican-Octopress theme to use Ipytgib Notebook better and
I wanted to be able to do that. So I modeled my changes on his. Just needed to add some code to the header to incoprorate additional css handling the Notebook.

* Just needed to add three lines to header to later pull in code when Pelican generates code
* see https://github.com/duilio/pelican-octopress-theme where something similar had been done
dding all the special css for handling all the custom features IPython Notebook in Bootstrap 3 Theme

jakevdp had a lot of custom css for handling his fancy plugins and the IPython Notebook. My direct conversion of the bootstrap 3 Pelican theme made these look not so good. So I added a big block of css to the end of the header in base.html of the theme.

* It isn't perfect (for example I don't have specific code highlighting in the 'The Code Include Tag' like jakevdp does) but mmany of the complex features work and look good, especially the IPython Notebook
* I also adjusted the css some for the bootswatch theme of spacelab I will use. This is at the very end of the head section in base.html