Started HW3 Part 3 Code

Created the grader.js and checks.json files. The execute successfully.
Updated checks.json To Include All CSS Classes

Added the classes listed in the homework assignment.
Completed HW 3 Part 3 - Grader.js Can Test Remote URLs

Finished the assignment. Now to submit.
Completed Part 1 of Homework 4 - Replaced Original Template with Responsive One

Typed by hand the template defined in the PDF provided by the class at
https://spark-public.s3.amazonaws.com/startup/images/part1-instructions.pdf