Add submodule pointer

Add ExportClassKerningToUFO.py, which mirrors FontLab Class kerning into a UFO file.

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "Modules"]
+	path = Modules
+	url = https://github.com/adobe-type-tools/python-modules

Kerning/ExportClassKerningToUFO.py

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+#FLM: Export FontLab class kerning to UFO
+import os
+moduleFound = False
+
+try:
+    from kernExport import *
+    reload(kernExport)
+    moduleFound = True
+
+except ImportError:
+    modulePath = os.path.join(fl.userpath, 'Macros', 'System', 'Modules')
+    url = 'https://github.com/adobe-type-tools/python-modules'
+    print '''
+
+    Please make sure you have placed the "kernExport.py" module in your Macros/System/Modules folder:
+    %s
+    Get the module here:
+    %s 
+
+    ''' % (modulePath, url)
+
+
+if moduleFound:
+
+    # three options are possible; for further details see kernExport.__doc__:
+    # kernExport.ClassKerningToUFO(fl.font, prefixOption = 'MM')   # prefix kerning classes in MetricsMachine-style
+    # kernExport.ClassKerningToUFO(fl.font, prefixOption = 'UFO3') # prefix kerning classes in UFO3-style
+    # kernExport.ClassKerningToUFO(fl.font)                        # do not change the name of kerning classes (apart from side markers)
+
+    kernExport.ClassKerningToUFO(fl.font, 'MM')