Merge branch 'release-0.12.1' into develop

* release-0.12.1:
  Bumping version to 0.12.1
Account for hrefs with no text

When this happens we use the inline link, which in rst
is:

  `<http://thing>`_

Fixes aws/aws-cli#662
Merge branch 'empty-links' into develop

* empty-links:
  Account for hrefs with no text
Allow arguments to be undocumented

We have this for commands, now we need this for arguments
Merge branch 'undoc-arguments' into develop

* undoc-arguments:
  Allow arguments to be undocumented
Bumping version to 0.12.2
tMerge branch 'release-0.12.2'

* release-0.12.2:
  Bumping version to 0.12.2
  Allow arguments to be undocumented
  Account for hrefs with no text