Open-Sourced Tutorials for working with GIS data in R currently hosted at www.nickeubank.com/gis-in-r

• Migrate to a stand-alone domain: given contributions of others, it no longer feels appropriate to host on my own site (www.nickeubank.com/gis-in-r). I've registered www.gis-in-r.org, just need to build index page.
• Add Makefiles: The current setup makes it hard to easily update and re-make all the markdown documents, so next step is adding a makefile to automate the process.
• Remove any reference to @data? Since updating how attribute merges are done, it's not clear users need to be exposed to the @data operation. Worth removing? Suggested by @edzer.