Cpsk datematch

* Plugin is now able to also match date when user specifies it in query. For instance `10.12.2014 bus z TO do BA`
* Also added more examples
* Don't throw exception when there are no results, rather return "Nothing found"

This closes #29 
Is this really the way you'd structure a query in a real world scenario? I'd personally go with `bus z ZA do BA 20.12.2014` and then `vlak z BA do TO 20.12.2014 o 15:00`. Unfortunately we don't have facilities for doing grammar-based matching at this time but we'll get there.