Adds SITEBRAND documentation to README.md
Adds breadcrumbs documentation to README.md
Adds navbar-inverse documentation to README.md
Adds related-posts documentation to README.md
Merge branch 'fix-readme' of https://github.com/magnunleno/pelican-bootstrap3 into magnunleno-fix-readme

* 'fix-readme' of https://github.com/magnunleno/pelican-bootstrap3:
  Adds related-posts documentation to README.md
  Adds navbar-inverse documentation to README.md
  Adds breadcrumbs documentation to README.md
  Adds SITEBRAND documentation to README.md
Some changes to the README and renamed SITEBRAND to SITELOGO