move the responsive navbar transition to 767 from 979

bootstrap-responsive css generated by `make bootstrap-css`
in the bootstrap-2.3.2 repo, after changing @navbarCollapseWidth to 767px in less/variables.less
fix padding issues with new navbar-collapse boundary
Merge pull request #204 from minrk/responsive-navbar

move the responsive navbar transition to 767 from 979
Use the download attribute for the download notebook button.

Unfortunately, this only works in Chrome, because Firefox doesn't let
you force a cross-domain link to download (to be fair, that's what the
spec says, it's just annoying in our case).
Merge pull request #206 from takluyver/download-attr

Use the download attribute for the download notebook button
add missing min-width change from #204

caused 'Download Notebook' text to be visible in the 768-979 range
Merge pull request #209 from minrk/menu-text

add missing min-width change from #204
Removing manual style overrides that will soon be done in ipython.
Adding bower based requirejs.
Moving jquery/require.js to the top of the body.
Install IPython from the beta release tarball
Directly add requirements for nbconvert
Merge pull request #212 from rgbkrk/2.0beta

Install IPython from the beta release tarball
Merge pull request #210 from ellisonbg/code-style

Removing manual style overrides that will soon be done in ipython.
Merge pull request #211 from ellisonbg/js-top

Add require.js to static/components and load jQuery/require.js at the top of the page
add IPython version info to footer
add render date to notebook footer
Merge pull request #214 from minrk/ipython-version

add IPython version info to footer
ensure pre, code has 'monospace' font family

something recent resulted in input cells receiving the bootstrap css for code areas
move nbviewer css to nbviewer.css