Return previous perm if exists while registering

Return previous perm if exists while registering

added ActionsStrSlice

added ActionsStrSlice

Added inheritance

Added inheritance versions(..Inherited) of the following functions.
Non-inheritance versions check current role and direct parents. Inherited versions checks all ancestors.

IsGranted -> IsGrantInherited
IsGrantedStr -> IsGrantInheritedStr
AnyGranted -> AnyGrantInherited
AnyGrantedStr -> AnyGrantInheritedStr
AllGrantedStr -> AllGrantInheritedStr
Role.isGranted -> Role.isGrantInherited
Role.isGrantedStr -> Role.isGrantInheritedStr

Added Role.HasAncestor to do a recursive ancestor check.

Thanks to @brendesp for these contributions.

Deep parent role check

Deep parent role check is added.

Thanks to @brendesp

Patches

• Patch for nil perm.
• Patch for misleading error log message

Added AnyGrantedStr,AllGrantedStr

Added AnyGrantedStr,AllGrantedStr

Patch release

Added GetAllPermissions() for listing all available permissions and some more tests.

Refactored release

• Replaced file operations with io.Writer and `io.Reader'
• Added an example for granular permissions to README.md

Stable release

• Added option to set logger (rbac.SetLogger())

First release

• RBAC
• Role parent inheritance
• Role persistance(load/save)
• Echo framework middleware