basic tsv_reader.cc and returns a TsvData *

We now have a Makefile! type 'make' to build tsv_reader_example. This is
a short program that demonstrates use of the tsv_reader.cc's function

TsvData * NewTsvDataFromFile(const std::string);

and gets data from tsvReaderExample/example.tsv
Merge branch 'master' of github.com:jonngwx/grad-shafranov