Remove unused imports that where Python2.4-incompatible.

IPython/frontend/frontendbase.py

@@ -27,8 +27,6 b' import _ast'
 from IPython.frontend.zopeinterface import (
     Interface, 
     Attribute, 
-    implements, 
-    classProvides
 )
 from IPython.kernel.core.history import FrontEndHistory
 from IPython.kernel.core.util import Bunch

IPython/frontend/zopeinterface.py

@@ -16,13 +16,6 b' __docformat__ = "restructuredtext en"'
 #  the file COPYING, distributed as part of this software.
 #-------------------------------------------------------------------------------
 
-#-------------------------------------------------------------------------------
-# Imports
-#-------------------------------------------------------------------------------
-import string
-import uuid
-import _ast
-
 try:
     from zope.interface import Interface, Attribute, implements, classProvides
 except ImportError: