Merge branch 'release-0.12.0' into develop

* release-0.12.0:
  Bump version to 0.12.0
Fix pep8 issues
Escape the ':' in hrefs

Otherwise you'll get a rendering error.
Merge branch 'escape-hrefs' into develop

* escape-hrefs:
  Escape the ':' in hrefs
  Fix pep8 issues
Bumping version to 0.12.1
Merge branch 'release-0.12.1'

* release-0.12.1:
  Bumping version to 0.12.1
  Escape the ':' in hrefs
  Fix pep8 issues