Dealing with vectors

So this is the dealing with vectors. I have used the `world.shp` file throughout. The contents of this notebook deal with:

1.- Opening vector files
2.- Poking around the features (reading fields, looking at geometries, etc)
3.- Simple attribute or geographical extent subsetting
4.- Rasterisation
5.- Using matplotlib to plot geometries [optional]

I don't really add much by way of geoprocessing and plotting, because there are very nice python packages for this already (fiona, shapefly and descartes). The only thing I feel is missing is demonstrating how to buffer some geometries, but it already looks like quite a lot!!!