set up mongodb instance and wrote code to app.js so the app is pointed to the default test database
wrote code for saving the neccessary information to the test database
cleaned up JavaScript
added a validation scriptfor checking the amount input. I also wrote markup and css for this as well.
wrote code to check for 404 status, so users will be shown a 404 page if they request a page other than / or /convert
worte code for global variables
cleaned up markup in all of the views
moved markup from index.ejs to footer.ejs

This is a good commit beacause the app is now pointed to a MongoDB test database and is able to save the necessary information to this database.
In addition, the code is cleaner and now there is 404 error handling. Next: I should add server-side validation for the amount input field and sanitize this data (if need be). I also need slidce up the iamges for the app and code the CSS.