Introducing the rcsvw R library

Hello WG,

I'd like to introduce the R implementation that I'm developing (rcsvw):

https://github.com/davideceolin/rcsvw

The library relies on a custom version of the rrdf and rrdflibs libraries
which I developed and I maintain here (basically this version adds some
functionalities like blank node creation and manipulation, and updates to
jena 3.0.0):

https://github.com/davideceolin/rrdf/tree/new_functionalities

Installing the rrdf library could be troublesome, especially because of the
rJava library it depends on. I document the steps needed to fix the
installation on OSX 10.10 and 10.11 in the README. I would be happy to make
any addition to those installation notes (e.g., about other OS's).

I designed the tests using the testthat library. At the moment, it passes
only 12 of them (6 for the csv2json function, 6 for csv2rdf). However,
given that I should have overcome the most annoying hurdles, I do
optimistically hope to progress quickly from now on (both in terms of
functionalities and of beautifying the code).

A paper about this is coming along. Any feedback is more than welcome, of
course.
Best,

Davide