Character Counter (Chars.pm) - More triggers, quoted strings and better tests

Trying to get the DuckDuckHack experience first hand! I see that some of the docs are based on this instant answer, so no worries if you would prefer to leave the IA as it is.

Includes a bunch of tests for the triggers and the different expected behaviors. All currently passing.
`s/^\s+|\s+$//g;` is usually what we use, but this is okay, too