added has_any_role and fixed has_roles

README.textile

@@ -103,6 +103,8 @@ Embedded Role model (Document stores only):
 
 Currently the embedded strategies have only been implemented for Mongoid.
 
+See "Roles strategy configuration":https://github.com/kristianmandrup/roles_generic/wiki/Roles-strategy-configuration for more info
+
 h2. Role API
 
 The full Roles API is described in these Wiki pages:

lib/roles_generic/generic/user/implementation.rb

@@ -42,9 +42,14 @@ def exchange_role role, options = {}
       exchange_roles role, options
     end
 
-    # check if a given role has been assigned 
-    # if a list of roles: check if ALL of the given roles have been assigned 
+    # check if all of the roles listed have been assigned to that user 
     def has_roles?(*roles_names)
+      compare_roles = extract_roles(roles_names.flat_uniq)
+      (compare_roles - roles_list).empty?      
+    end
+
+    # check if any of the roles listed have been assigned to that user
+    def has_any_role?(*roles_names)
       compare_roles = extract_roles(roles_names.flat_uniq)
       (roles_list & compare_roles).not.empty?      
     end