Track screen size, viewport size, screen pixel bits and language
Move constant arguments to constructor
Merge branch 'master' into feature/more-browser-data

Conflicts:
	changelog.md
Merge pull request #28 from Fox32/feature/more-browser-data

Track screen size, viewport size, screen pixel bits and language
update readme
document the send methods
Merge pull request #34 from dart-lang/devoncarew_readme2

Devoncarew readme2