Fix some typos in README

README.rdoc

@@ -2,7 +2,7 @@
 
 RoleModel is the framework agnostic, efficient and declarative way to do
 (user) roles. Assigned roles will be efficiently stored as a bitmask
-directly into your model within an configurable attribute.
+directly into your model within a configurable attribute.
 
 It works like this:
 
@@ -12,7 +12,7 @@ It works like this:
   
   class User
     attr_accessor :roles_mask   # just for demo purposes
-    # in real life this would usuallt be a persistent attribute,
+    # in real life this would usually be a persistent attribute,
     # e.g. if your User model is persisted in a SQL-DB add an integer
     # column named roles_mask to your users table -- just remove/replace
     # above attr_accessor line with whatever is needed for your