Fix/hide classes holidays

[joshL1215]

Added new feature:

• Stores the holidays that UCSB observes in memory
• When frontpage is opened, checks the current day to see if it is a holiday
• If today is a holiday, the frontpage daily course section displays what holiday it is and that there is no class that day, even if users' schedule does have courses listed on that day

Can be tested by setting the client's date to each holiday to check for desired behavior. I did this already but I had to set the date inside of the source code itself since the current date is compared against the holidays before you are able to run a console command in your browser.

Resolves #40