Environment variables support

[jollymover]

Hi Matthew!

Thank you for the plugin. It work like charm.

Any options to use an environment variable instead of password field in ad.yml?

[mdhowle]

Sure, I'll add that in next week.

[mdhowle]

I haven't tested, but I push a change to the environ branch.
You can set username and password with ANSIBLE_AD_INVENTORY_USERNAME and ANSIBLE_AD_INVENTORY_PASSWORD respectively.