Add missing .conf to config files

Closes #45
Merge pull request #46 from johtso/issue-45

Add missing .conf to config files
Avoid config key clashes

Fixes #48
Merge pull request #49 from johtso/issue-48

Avoid config key clashes
Added salt-cloud support for Rackspace OpenStack servers.
Merge pull request #50 from andrew-vant/rsprov

Added salt-cloud support for Rackspace OpenStack servers.
Added recursive management of minion.d and master.d.

This allows users to easily add configuration settings that the formula
doesn't yet provide, without having to modify the existing templates.
Merge pull request #51 from andrew-vant/salt.d

Added recursive management of minion.d and master.d.
Readme note about user-provided configuration templates.
Merge pull request #52 from andrew-vant/salt.d.doc

Readme note about user-provided configuration templates.