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.
Sounds like a good idea if we use it in other places. But currently we don't in the Goodies repo so I was trying to avoid adding additional modules.