New QGIS Packaging

I’ve made the installation of QGIS simpler, by including the GDAL and Matplotlib packages. For now this only applies to the long term support release (2.8), and I’ll probably only update the download when QGIS is updated, so the separate frameworks may be newer than what is packaged with QGIS. If I try to update the whole thing every time one part changes, it’ll just get messy. I also added a note to the first readme about installing multiple versions of QGIS, basically don’t.