Remove sleep and constant usage warnings

HACKING

@@ -36,12 +36,6 @@ lock up the entire module when called from other interfaces. If you
 need user input, you can either register an option or expose an 
 interactive session type specific for the type of exploit.
 
-3. Don't use "sleep". It has been known to cause issues with
-multi-threaded programs on various platforms running an older version of
-Ruby such as 1.8. Instead, we use "select(nil, nil, nil, <time>)" or
-Rex.sleep() throughout the framework. We have found this works around
-the underlying issue.
-
 4. Always use Rex sockets, not ruby sockets.  This includes
 third-party libraries such as Net::Http.  There are several very good
 reasons for this rule.  First, the framework doesn't get notified on
@@ -92,11 +86,6 @@ and libraries. If you need a "global" within a specific class, you can
 use @@class_variables, but most modules should use @instance variables
 to store information between methods. 
 
-10. Do not define CONSTANTS within individual modules. This can lead to
-warning messages when the module is reloaded. Try to keep constants
-inside libraries and mixins instead.
-
-
 Creating New Modules
 ====================