Add README.md
Merge pull request #11 from joshmiller83/readme-pr-2

Add README.md
Behave properly when devel.module is not enabled.
Merge pull request #14 from FGM/devel_support

Behave properly when devel.module is not enabled.
Merge branch '8.x-2.x' of github.com:commerceguys/commerce into 8.x-2.x