fix json typo
Added ansible-vault to the installer
Merge pull request #6103 from bryfry/patch-1

fix json typo in documentation
Merge pull request #6105 from tonk/with_vault

Added ansible-vault to the installer
Add async test role
Add handlers test
Add test for basic lookups
Update README.md

Minor readme tweaks since I haven't edited this in a while.
Update README.md