Basic GridObject and .info() function

[Teschl]

I also removed the examples/ from .gitignore

[wkearn]

This looks good. We'll probably want to address @wschwanghart's comments on #6 at some point, but if we need to make changes based on those comments, it shouldn't be too hard at this point to add things to the current version of GridObject.

The one thing we probably should figure out now is the name: GridObject as we have it here or GRIDobj like the MATLAB version or something else? I assume that the argument for GridObject is that it sounds more like other Python classes, right? Why not drop the Object and call it Grid?

[Teschl]

Anna-Lena always preferred the GridObject variant to GRIDobj since it's the "pythonic" variant as specified in PEP 8.

We could also add aliases in the __init__.py file. That way, GridObject, Grid or GRIDobj would all work, and the user can pick whichever they like best.