Creating commit for PhpRbac v2.0 Beta release.
Updated "Usage" section of README.md
Fixing an error when using mysqli
Include $adapter for mysqli
Merge pull request #18 from bblue/master

Fix issues when using mysqli (if had a semicolon at the end)
Fixing statement in RoleManager->Permissions() fn

*_permissionshas no column PermissionID but just ID
Merge pull request #21 from bleuscyther/patch-1

Fixing statement in RoleManager->Permissions() fn
Added "What is an Rbac System?" section to README.md.
Made and edit to "What is an Rbac System?" section of README.md
Merge branch 'master' into dev/PSR/Unit_Tests

Conflicts:
	PhpRbac/src/PhpRbac/core/setup.php