Change username-password to keypair auth.
Clarify wording, remove last mentions of username/password.
Merge pull request #132 from castrojo/horizon-hp

Change HP Cloud config from username/password to keypair
Updates from review.
Merge pull request #133 from abentley/add-ha

Updates from review.
Update troubleshooting.md
added 1.20 release notes
Update authors-charm-best-practice.md
added release notes for 1.20.1
clarification and link for destroy-environment
Minor spelling typo
Merge pull request #134 from johnweldon/typo

Minor spelling typo
Fix box URL.
Merge pull request #135 from castrojo/fix-vagrant-url

Fix box URL.
Temporarily remove the Precise Vagrant images pending good smoke tests
Merge pull request #136 from chuckbutler/pull_precise_vagrant_images

Temporarily remove the Precise Vagrant images pending good smoke tests