Added a basic wrapper class to do query validation (in the `utils`
 module). Added a function to the scraper to split the incoming CSV file
into smaller chunks before attempting to iterate through it row by row
and shove it into Mongo. Another obvious approach would be to use the
mongoimport command line tool but that may or may not do what you want
it to in terms of converting the dates to actual date objects and
consistently making integers, etc.