Adds Breadcrumbs

When setting the DISPLAY_BREADCRUMBS flags, the site will have
breadcrumbs in the following templates: archives, article, category,
categories, page, tag and tags.
Removes Category in article breadcrumbs

By default the categories should not be mentioned in the article
breadcrumbs, but can be activated setting the flag
DISPLAY_CATEGORY_IN_BREADCRUMBS = True
Merge branch 'master' of https://github.com/magnunleno/pelican-bootstrap3 into magnunleno-master

* 'master' of https://github.com/magnunleno/pelican-bootstrap3:
  Removes Category in article breadcrumbs
  Adds Breadcrumbs

Conflicts:
	templates/base.html