Fixed contrib scripts. Added *.pyc cleaning scripts

contrib/clean_pyc.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# Display information
+echo "This script will remove *.pyc files. These files are generated by Python, but they can cause conflicts after an upgrade. It's safe to remove them, because they will be regenerated."
+echo "Press enter to continue, or CTRL + C to quit."
+read
+
+# Remove the *.pyc
+find "`dirname $0`/.." -type f -name "*.pyc" -exec rm -rf {} \;