Add newline, spaces on string format

Add newline on end of file, put spaces around the string operator (pep8/pylint).

IPython/lib/display.py

@@ -48,4 +48,4 b' class YouTubeVideo(object):'
                 frameborder="0"
                 allowfullscreen
             ></iframe>
-        """%(self.width, self.height, self.id, params)
  No newline at end of file
+        """ % (self.width, self.height, self.id, params)