Remove ifthen dependency from sphinx.sty and update CHANGES

CHANGES

@@ -6,6 +6,7 @@ Incompatible changes
 
 * LaTeX package fancybox is not longer a dependency of sphinx.sty
 * Use ``'locales'`` as a default value of `locale_dirs`
+* LaTeX package ifthen is not any longer a dependency of sphinx.sty
 
 Features added
 --------------

sphinx/texinputs/sphinx.sty

@@ -19,8 +19,6 @@
 % For framing code-blocks and warning type notices, and shadowing topics
 \RequirePackage{framed}
 \newif\ifSphinx@inframed % flag set if we are in a framed environment
-% ifthen not used anymore and will be removed at Sphinx-1.5
-\RequirePackage{ifthen}
 % The xcolor package draws better fcolorboxes around verbatim code
 \IfFileExists{xcolor.sty}{
     \RequirePackage{xcolor}