fix for truncate and invalid_char_action values
Merge branch 'bugfix/invalid_char_action' of github.com:tompesman/clockwork-ruby into tompesman-bugfix/invalid_char_action
Tweak tests as invalid_char_action is stored as number
Put invalid_char_action values in correct order

Leave truncate as true/false rather than 0/1 to match other boolean parameters such as long
Merge in invalid_char_action fix from @tompesman, in pull request #8