BUG: Fix incorrect argument signature for show_in_pager dummy hook.

IPython/core/hooks.py

@@ -173,7 +173,7 b' def late_startup_hook(self):'
     #print "default startup hook ok" # dbg
 
 
-def show_in_pager(self,s):
+def show_in_pager(self, data, start, screen_lines):
     """ Run a string through pager """
     # raising TryNext here will use the default paging functionality
     raise TryNext