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>