Add documentation to style guide as to why absolute imports should be avoided.

doc/topics/conventions/style.rst

@@ -115,6 +115,21 @@ This is a good way to import exceptions:
 
     from salt.exceptions import CommandExecutionError
 
+
+Absolute Imports
+----------------
+
+Although `absolute imports`_ seems like an awesome idea, please do not use it.  
+Extra care would be necessary all over salt's code in order for absolute 
+imports to work as supposed. Believe it, it has been tried before and, as a 
+tried example, by renaming ``salt.modules.sysmod`` to ``salt.modules.sys``, all 
+other salt modules which needed to import :mod:`sys<python2:sys>` would have to 
+also import :mod:`absolute_import<python2:__future__>`, which should be 
+avoided.
+
+.. _`absolute imports`: http://www.python.org/dev/peps/pep-0328/#rationale-for-absolute-imports
+
+
 Vertical is Better
 ==================