Remove contribs and examples

Everything has now been moved to a separate repository at
https://github.com/GrammaticalFramework/gf-contrib
The contents of the examples folder are build during SetupWeb

examples/foods/README

@@ -0,0 +1,8 @@
+Foods grammars from GF Summer School 2009. To build:
+
+  $ gf -make -s Foods???.gf                        -- to create Foods.pgf
+
+  $ mv Foods.pgf ~/GF/src/server/gwt/www/grammars/ -- to use in web applications
+
+
+