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.
@jagtalon it actually wouldn't add a dependency to Goodies, it would be added to DuckDuckGo and then we could remove it from Spice if we used the helper fn where `String::Trim()` is being used. Neat eh?