Avoid throwing exception when the same memory provider is attached to
ACL which avoid orchestral/extension#42

Signed-off-by: crynobone <crynobone@gmail.com>
add additional role checker

Signed-off-by: ahmadshah <ahmadshahhafizan@gmail.com>
Merge pull request #24 from ahmadshah/feature/role-checker

Add additional role checker
Merge branch '2.1'