Add getPath, setPath, mapPath and so on

[5outh]

This will be a major change but it should be really easy. I want to make it so that:

nanoscope(obj).path('a.b.c').get();

is the same as:

nanoscope(obj).getPath('a.b.c');

just for conciseness. Writing the former gets a little noisy and I'd like to avoid noise whenever possible. Another option would be something like:

nanoscope(obj).get.path('a.b.c');

but I think this would require too much unsafe finagling of already existing functions, plus I think it's less pretty. The first will be kind of brute-force but safer and easier. I want this done for not only path, but all of the primitive lenses.