Requirements:
 1.) Ruby 2.0 + installed
 2.) No external gems were used.

To Run Tests (uses built in minitest framework):
 1.) Open up Terminal.
 2.) Go into '/parser_app' directory
 3.) Type 'rake test'

To See Rake Options:
 1.) Inside of Terminal type 'rake'

To Run the App and See the Output:
 1.) Open up Terminal.
 2.) Go into '/bin' directory inside the app.
 3.) To run the app type 'ruby parser_app.rb 1' or 'ruby parser_app.rb 1 2 3'
     1 => 'Output sorted by gender and last name'
     2 => 'Output sorted by birth date and last name'
     3 => 'Output sorted by last name'

Notes:
 1.) Some assumptions were made about the incoming data, such as:
     Data would come in the same consistently, based on the type of delimiter the data file was using.
 2.) Explanation of approach:
     Parse through each line to determine the delimiter being used based on the three accepted delimiters(Pipe,comma, and space).
     Based on the delimiter found, pass data to the appropriate data mapper for that type.
     Hydrate a person object with the incoming data, and inject the person into an array.
     Once all the data has been parsed through, sort the arrays based on the specified sort type,
     Then call the overwritten .to_s method.
        The overwritten .to_s method returns a representational string of the person object, in the desired field order (e.g. Last Name First Name etc.)
 3.) For a real world application, that collected real data, I would have used an ETL tool that listens in for new files being dropped in, or triggered either based on a schedule or on some sort of listener event. Thank you.