Modify makefile to support github publishing to a branch other than gh-pages
Use the pelican-bootstrap3 theme

Changes the site to use the pelican-bootstrap3 theme rather than the default
notmyidea theme. This requires you to have installed the pelican-bootstrap3
theme by doing the following:
    # Get the pelican themes collection
    $ git clone --recursive https://github.com/getpelican/pelican-themes.git /path/to/themes
    # installify
    $ pelican-themes -i /path/to/themes/pelican-bootstrap3

In addition to theming changes, this also makes some minor consistency fixes in
the use of unicode literals. Using u'' is unnecessary cruft when we've
imported unicode_literals.