Make FAO parser more modular [should we do it now?]

### Expected Behavior / Situation
One parser.js file that can dynamically convert csv files from any directory into a json file in that same directory.

### Actual Behavior / Situation
One parser.js file that can convert csv files from its own directory into a json file in that same directory.

### Modification Proposal
Let's discuss this, but one way forward would be to write a script for parser.js that takes an argument—the path to the directory containing the target csv file—and then outputs a json version of that file in the given directory.