Rewrote dining.py to work with the new site

[jeffzheng13]

Forewarning this is my first ever pull request, so sorry if this formatting is bad 😣

• Used Chrome's network tools on dineoncampus.com/pit to see what calls were made
• Made the requests to the same API the site was making
• Methods work but wasn't too sure on what other functionality should be added (a lot was just parsing json)
• Added get_location_hours(), get_menu(), get_all_locations()
• Data structures used to store data is a little convoluted
• Have not written JUnit tests to test the program but it works and returns correctly so far

[tianyizheng02]

Closing this PR because I think this has been superseded by #161