Break long word in sidebar.
Move .wordbreak into #sidebar.
Remove unused class.
Merge branch 'word-break' of https://github.com/marlboromoo/pelican-bootstrap3 into marlboromoo-word-break

* 'word-break' of https://github.com/marlboromoo/pelican-bootstrap3:
  Remove unused class.
  Move .wordbreak into #sidebar.
  Break long word in sidebar.