travel: added cpsk bus and train info

Please, would you mind testing it before merging? I haven't managed to get imhd running :/
I quite do not understand the `@example` here. This is not C++ or Java AFIK, I believe we should adhere to PEP8 as much as we can and try to follow Google Python style guide (https://google-styleguide.googlecode.com/svn/trunk/pyguide.html#Comments) where possible. That would be here too.

It would be fifferent if we were trying to use doxygen or something else to postprocess the docstrings but I do not think that is happening and thus this will just create another edge case for help message processing.

So please, stick to the following: description on the first line, Examples section afterwards. You can take the following as a reference (https://github.com/mrshu/brutal-plugins/blob/master/basic.py#L65)