Map namespaces and import

[aslakhellesoy]

Maps (and other objects created with the text mapper macros) should be considered namespaced when they are created. It should be possible to import all maps from a namespace, or just some of them. The thinking is that people might want to override a certain map from a library (think like with Aruba or the Web steps), but not all of them.

[msassak]

Related: https://groups.google.com/d/topic/cukes/HUSJa7Y8AE4/discussion