doc: Update copyright date.
doc: Switch to bootstrap yeti theme.
doc: Disable bootstrap's source link generation.

We already have that link in the side bar.
doc: Remove search box from side bar.

It's already there in the top navbar.
doc: Switch to CSS used on tests.obspy.org.
doc: Use navbar and footer from tests.obspy.org.

Eventually, this should be automatically downloaded somehow.
doc: Disable sidebar on front page.

It's currently empty, and this leaves more room for the new logo.
doc: Use new logo!
doc: Re-indent makefiles slightly.
doc: Add script for saving local copy of assets.

When building for the server, use "make serverhtml" instead, which
specifies links to CDN, etc.
doc: Reinstate custom CSS.

The following styles were not included:
 * Remove several 'pre' stylings which are done by the Bootstrap theme.
 * Remove 'table.docutils' styling. Bootstrap's style appear adequate,
   and this doesn't work anyway since the 'docutils' class is removed by
   some JS.
 * Remove 'margin-top' on 'table.hlist td ul'. All 'ul' are reset by
   Bootstrap already.
doc: Use epigraph for quotes.
doc: Bootstrap-ify the overview page.

It should be more responsive now, and have a couple things better
aligned, too.
doc: Remove sidebar from index pages.

The ToC doesn't seem to be generated for these pages, so just disable it
for now.
doc: Remove some unintentional blockquotes.

I may have introduced a few of these when I didn't understand reST
syntax as well. This was not a problem with the default theme, but on
bootstrap, the blockquote appears out of place.
doc: Convert print statements to functions.
doc: Remove local copy of plot_directive.

We already depend on matplotlib.sphinxext.only_directives, which is
needed by plot_directive, but not used by us anywhere. So why not depend
on the thing we actually use, and drop an extra file.

I am aware this breaks the gallery, for the moment. This will be fixed
soon-ish.
doc: Add necessary wrapper divs around content.
tutorial: Migrate seismometer example to FDSN.
doc: Import all of bootstrap's layout.html.

We've already got most of it to get the wrapper div's in place, so I
figure we might as well use all of it. We don't need all the v2
compatibility stuff, so it's not as big as the original. Plus, this
saves us the duplicate CSS files.