replaced throw_error with throw_exception
Wrote tests for ConflictDetectedInCheckRoleExclusionsInToClass & ClassDoesTheExcludedRole
Wrote ConflictDetectedInCheckRoleExclusionsInToClass & ClassDoesTheExcludedRole
removed ->throw_error (forgot to remove earlier)
removed whitespace
replaced throw_error with throw_exception
Wrote tests for CannotCreateMethodAliasLocalMethodIsPresentInClass
Wrote exception CannotCreateMethodAliasLocalMethodIsPresentInClass
passed  as an attribute to the exception
Wrote tests for second_role attribute to RoleDoesTheExcludedRole
Added second_role attribute to RoleDoesTheExcludedRole
replaced  = ... with throw_exception
Wrote tests for MethodNameConflictInRoles
Wrote exception class MethodNameConflictInRoles
committed ConflictDetectedInCheckRoleExclusionsInToClass (forgot to commit earlier)