rename, and open up detector API

Emitter -> EventEmitter
Detector -> EventDetector

EventDetector has had most of its private methods made public and the
single public "ignore" method removed.
added trivial example to show usage
update pubspec description
white space/heading/README

white space/heading/README
pubspec.yaml info change
README formatting
pubspec fix
dartdocs
fix readme formatting
increment version
Merge pull request #5 from 0xor1/dev

dev -> master