Remove capitalised exit forms.

IPython/core/interactiveshell.py

@@ -1028,8 +1028,8 b' class InteractiveShell(Configurable, Magic):'
         # Store myself as the public api!!!
         ns['get_ipython'] = self.get_ipython
         
-        for n in ['exit', 'Exit', 'quit', 'Quit']:
-            ns[n] = self.exiter
+        ns['exit'] = self.exiter
+        ns['quit'] = self.exiter
 
         # Sync what we've added so far to user_ns_hidden so these aren't seen
         # by %who

IPython/lib/tests/test_irunner.py

@@ -77,7 +77,7 b' for i in range(5):'
 
 print "that's all folks!"
 
-Exit
+exit
 """
         output = """\
 In [1]: print 'hello, this is python'
@@ -124,7 +124,7 b' In [11]: print "that\'s all folks!"'
 that's all folks!
 
 
-In [12]: Exit
+In [12]: exit
 """
         runner = irunner.IPythonRunner(out=self.out)
         self._test_runner(runner,source,output)