Backport PR #2546: use 4 Pythons to build 4 Windows installers

See [stdlib docs](http://docs.python.org/2/distutils/builtdist.html#cross-compiling-on-windows) for why this has to be.

I don't know a better way than hard-coding the paths to four Pythons, since there is no natural way to have all of these available on your PATH.

This script (with PROPER and FIXED additions) is how I built/uploaded the two fixed installers.

closes  #2531

tools/release_windows.py

@@ -1,52 +1,66 b''
 """
 build [and upload] Windows IPython releases
 
 usage:
 
 python tools/release_windows.py [--github] [--pypi]
 
 Meant to be run on Windows
 
 Requires that you have python and python3 on your PATH
 """
 
 import glob
 import os
 import shutil
 import sys
 
 from toollib import sh
 try:
     import gh_api
 except ImportError:
     gh_api = None
 
 github = '--github' in sys.argv
 
-cmd_t = "{py} setup.py bdist_wininst --plat-name={plat}"
+cmd_t = "{py} setup.py bdist_wininst"
 
 pypi = '--pypi' in sys.argv
 pypi_cmd_t = "python setup.py upload_wininst -f {fname}"
 
-for py in ['python', 'python3']:
+# Windows Python cannot normally cross-compile,
+# so you must have 4 Pythons to make 4 installers:
+# http://docs.python.org/2/distutils/builtdist.html#cross-compiling-on-windows
+
+pythons = {
+    2: {
+        'win32' : r'C:\\Python27\Python.exe',
+        'win-amd64': r'C:\\Python27_64\Python.exe',
+    },
+    3: {
+        'win32' : r'C:\\Python33\Python.exe',
+        'win-amd64': r'C:\\Python33_64\Python.exe',
+    },
+}
+
+for v,plat_py in pythons.items():
     # deliberately mangle the name,
     # so easy_install doesn't find these and do horrible wrong things
-    v = 3 if py.endswith('3') else 2
     try:
         shutil.rmtree('build')
     except OSError:
         pass
-    for plat in ['win32', 'win-amd64']:
+    for plat,py in plat_py.items():
         cmd = cmd_t.format(**locals())
         sh(cmd)
         orig = glob.glob(os.path.join('dist', 'ipython-*.{plat}.exe'.format(**locals())))[0]
         mangled = orig.replace('.{plat}.exe'.format(**locals()),
                                '.py{v}-{plat}.exe'.format(**locals())
         )
         os.rename(orig, mangled)
         if pypi:
             sh(pypi_cmd_t.format(fname=mangled))
         if github and gh_api:
             print ("Uploading %s to GitHub" % mangled)
             desc = "IPython Installer for Python {v}.x on {plat}".format(**locals())
             gh_api.post_download('ipython/ipython', mangled, description=desc)