Add "demo script" for running git bisect

contrib/run_bisect.sh

@@ -0,0 +1,13 @@
+#! /bin/bash
+# Instructions
+# Create a .jl file that looks like this:
+#        function test()
+#           do some stuff, perhaps return a value
+#        end
+#        @assert test() == 5   # 5 is the correct answer if all is working
+#        exit()
+# Then provide the name of that function after the "julia" call below
+make clean   # or cleanall if necessary
+make
+julia /tmp/test.jl
+exit $?