Added data regarding where the previous HTML timetable should be stored.
Fixes to allow compatibility with previous commit + silenced some exceptions (expected exceptions) on lessonparser
Lessonparser should be able to deal with updated html.

Lessonparser saves the last parsed html, compares with the current and:
	- If equal, skips it,
	- Deletes outdated Lessons from the DB
	- Inserts updated Lessons into the DB

Needs testing