added cleanup script to remove all binary files from directories

tests/cleanup.bash

@@ -0,0 +1,14 @@
+# This simple script ensures that all binary
+# output files have been deleted in all the
+# folders. This can occur if a previous error
+# occurred and the test suite was rerun without
+# deleting left over binary files. This will
+# cause an assertion error in some of the 
+# tests.
+for i in ./*; do
+  if [ -d "$i" ]; then
+    cd $i
+    rm -f *.binary *.h5
+    cd ..
+  fi
+done