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 
I know this is my stuff but can you please make this more readable? It's extra tough to understand what this does, let alone how it does it.