Revert "Remove compatability guarantees for SLES"

This reverts commit 40c4826933848bf827e69e2276f0c9be05877344.
Merge pull request #175 from hunner/revert_sles

Revert "Remove compatability guarantees for SLES"
Add supported information and reorder to highlight support

Include notice that Git is the only supported provider and reorder README so Git is the first VCS addressed.
Merge remote-tracking branch 'laurenrother/readme' into 1.0.x
Merge branch '1.0.x'