updating Bootstrap and Bootswatch to version 3.1.0

this also adds four new Bootswatch themes: Cupid, Lumen, Superhero and
Yeti

Signed-off-by: Torbjörn Klatt <opensource@torbjoern-klatt.de>
fix style bug of source link

Bootstrap dropdowns don't need to be created via Javascript API but can
be achieved via HTML data-api only.

This fixes the styling of the source link as it wasn't executed
previously due to a Javascript error.

Signed-off-by: Torbjörn Klatt <opensource@torbjoern-klatt.de>
update included jQuery from 1.9.1 to 1.11.0

Just because we can. Shouldn't break anything with Sphinx.

Signed-off-by: Torbjörn Klatt <opensource@torbjoern-klatt.de>
override Sphinx's scripts

Don't ever load jQuery shipped with Sphinx. It does not work with
Bootstrap.
Unfortunately, we need to specify underscore.js and doctools.js
manually.

ToDo: test this behaviour with scripts added by other Sphinx plugins loaded prior to sphinx-bootstrap-theme. (probably does not work :( )

Signed-off-by: Torbjörn Klatt <opensource@torbjoern-klatt.de>
remove jQuery.noConflict mode

This finally made Bootstrap stop working now... No idea why.

Signed-off-by: Torbjörn Klatt <opensource@torbjoern-klatt.de>
Re-enable jqTheme and minor other tweaks.
Manually merge and close #90.