Update pelicanconf.py

Hi Rich, I'm answering your email here.

I'm almost sure that the modification above will solve your problem.  Here is what happened:

The _nb_header.html is the file that "injects" how the notebook will be rendered in the pelican themes.  If you ever change the theme you have to add those commented lines (64-67) into your theme.

The _nb_header_mod.html was a modification I made some time ago and abandoned because the plugins upstream fixed it better than my modified version.

Good luck.

PS1: Note that "_nb_header.html" can be updated if you update "pelican-plugins!" If you wish to freeze your layout copy the "_nb_header.html" as "_nb_header_mod.html" instead of applying the modification above.

PS2: You do not have your octopress theme nor the plugins directory in your repository.  They are empty for me when I clone your repository.  So I used mine and hopefully that are the same version and what I said above is valid.

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Any idea what controls my output cells coming out black?
http://rsignell-usgs.github.io/blog/blog/2014/01/15/csw_ngdc_dap/
I'd rather that was just grey like the rest...
Merge pull request #1 from ocefpaf/patch-1

Update pelicanconf.py