start to fix let statements to make vimp compatible with FF 35.0a1
change  to
apply changes made by caisui
Merge pull request #40 from Segaja/fix_let_statements

start to fix let statements to make vimp compatible with FF 35.0a1
Decrease autocommand verbosity, so we only show messages for verbose level >= 9. Fixes #44
Merge remote-tracking branch 'upstream/master'