replaced throw_error with throw_exception & added tests for RolesDoNoSupportExtends
Wrote RolesDoNotSupportExtends
replaced croak with throw_exception
Wrote tests for MustSpecifyAtleastOneMethod
Wrote Moose::Exception::Role::Role
Wrote tests for Moose::EXception::Role::Role
Wrote exception MustSpecifyAtLeastOneMethod
Wrote NeitherRoleNorRoleNameIsGiven (counterpart of NeitherClassNorClassNameIsGiven)