Don't include Bootstrap in codepygments module

[sloria]

I'm not sure that it's necessary to include Bootstrap for the codepygments module. We might just remove it.

Related issue: #176 - If we do need to include Boostrap, it would still be good to have a way to opt out of it.

[chrisseto]

+1
it looks like bootstrap is only used for the error messages.
Foundation is included and I think it could be removed as well.

[mfraezz]

While it would prevent #175, some of the Boostrap rules are necessary. Otherwise, it will look like this:

Misalignment and lack of a border are obvious, but it's also not horizontally scrollable. A simple solution would be to just include the 10 or so rules that pygments actually needs to render things nicely in default.css, and remove the Bootstrap dependency.

Agree with @chrisseto about Foundation, it doesn't appear to be used anywhere at all.

[mfraezz]

In fact, nothing in /pdb/css/ appears to be used.