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 
ouch, this is pretty confusing and spaghetti at the same time. Can we do this in a different manner? Such that `zajtra` would would always mean `1`, `pozajtra` would always be `2` and so on.