Do not call %run with quotes, since on Windows quotes aren't stripped.

On Posix, shlex strips quotes from filenames, but not on Windows.  So if we
call %run "somefilename" on Win32, we get a 'file not found' error.  This
problem was appearing for the test suite on win32.

IPython/core/tests/test_run.py

@@ -67,7 +67,7 b' def doctest_run_builtins():'
 
     In [6]: t1 = type(__builtins__)
 
-    In [7]: %run "$fname"
+    In [7]: %run $fname
 
     In [7]: f.close()
 
@@ -101,7 +101,7 b' class TestMagicRunPass(tt.TempFileMixin):'
         _ip = get_ipython()
         # This fails on Windows if self.tmpfile.name has spaces or "~" in it.
         # See below and ticket https://bugs.launchpad.net/bugs/366353
-        _ip.magic('run "%s"' % self.fname)
+        _ip.magic('run %s' % self.fname)
 
     def test_builtins_id(self):
         """Check that %run doesn't damage __builtins__ """