Space flight launch calendar parsing and calendar saving in one place.

1. Set up Google credentials. If you will be running this as a CRON job make sure they are set up as a service account
2. Download P12 private key for your service account and rename it launch-cal.p12
3. Place the P12 file in the src/main/resources directory
4. Set up a Google calendar
   1. Copy the calendar ID, this will be used as a property later and looks similar to <a-string-of-numbers-and-letters>@group.calendar.google.com
   2. Share the calendar with the service account's email
   3. Edit notifications as you see fit
5. Set the properties in properties.txt
6. Run gradle clean build
7. Run the produced JAR file