Added most of the code base; compiles, but didn't run any data through it.
ProcessQueryPairs no longer requires the output directory to exist; the directory will be made if it doesn't.
Removed an unecessary build line.
Added a section to the README and created a sample query pair file to go along.
In QFGOps, the term cache is now created if it doesn't exist.
Fixed parsing bug in QFGOps---it was using commas instead of tabs.
Changed the stderr printing a bit in the random walk code.
Updated samples/pairs.tsv with a set of dummy query reformulations; added a set of queries to find recommendations for (samples/queries.txt); updated README.md to show how to generate recommendations for queries.
Term random walk cache files are now stored in gzip format.