Added 404 and 500 templates to deal with those errors.
Parser prints errors to stdout but doesn't crash on them
lessonparser doesn't crash when no changes ocurr. Added some settings to store the timetables source files in a directory.

Also added some other stuff, like a bug to fix the ADMINS variable, and the allowed hosts, for deployment.
Added better support for dealing with errors and unexpected inputs at the views.
Minor fixes. Some import cleanups + usage of print as functions instead of as statement (for python 3 future compatibility)
add the timetable folder to the repo