Template logic for install instructions

It might be nice to have some template logic setup for R vs Python installation instructions. Would this cause problems in dual R/Python bootcamps with multiple rooms? I can put a PR together which implements the template logic for R, Python, both if that would be useful.

**Proposal:**

1. Add a template metadata variable `bootcamplanguage` to `/index.html` with `r`, `python` options.
2. Add some template logic to `_includes/setup.html` to select appropriate blocks based on value of `bootcamplanguage` so that setup instructions reflect the language being taught.

Do we need a `both` option for bootcamps that have both, or does/should each room get its own page?
I will fix it early on Monday morning.

> On Aug 14, 2014, at 7:12 PM, Greg Wilson <notifications@github.com> wrote:
> 
> In _includes/setup.html:
> 
> >    </div>
> >    <div class="span6">
> > +{% if page.lesons contains 'Python' %}
> I was hoping to merge this one this week, but other things have gotten in the way - merge currently scheduled for Monday next week. @jduckles, can you please fix this before then?
> —
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