Initial Commit of the Cross Country Assignment.

HTML: Complete implementation of all required components. Title,
headers, tables and buttons are all implemented.

JavaScript: Shortened code using a "process" method that takes in the
input and directs it to a specified method. Update method takes inputs
from table and calculates the third lap time, then displays it on a
lower "display only" table on the webpage. Erase method clears the
bottom table's data for a specified table. Revert method undoes the
input on the upper table to a previous state. Runner history is saved
through stacks.

CSS: Basic CSS implemented. Includes background color, font design,
padding and chart design. Might improve the padding on the lower table.