More accurate description of `waitOn`

For #336
Merge branch 'dev'
Update README.md (filters are properties now)

The coffeescript examples appear to be out of date. You no longer call a class level method, but supply a property.
Mention waitOn usage in Router.configure
Merge pull request #415 from dandv/patch-6

Mention waitOn usage in Router.configure
Merge pull request #406 from RobertLowe/patch-1

Update README.md (filters are properties now)