<a href='http://www.assembla.com/spaces/tracks-tickets/documents/apo91G0S8r3ymUab7jnrAJ'>application.rb.patch</a>: patch for using chronic

We could use the Chronic http://chronic.rubyforge.org/ library.

I put the chronic library in the lib path and made the changes to application.rb which are in the patch.
I disabled the calendar to test it.

This doesn't work together with the calendar. The calendar always updates the datefield. It is impossible to put in an "invalid" date like 'tomorrow' in it.

Maybe it is possible to stop the Calendar from always fixing the datefield.

Updating tickets (#373, #105, #107, #117, #125, #126, #147, #177, #182, #183, #185, #197, #202, #206, #220, #236, #240, #276, #283, #294, #300, #305, #309, #312, #317, #324, #337, #357, #358, #360, #433, #452, #462, #17, #74, #82, #92, #123, #265, #431, #440, #475, #94, #256, #258, #464)

Migrated to GitHub issue #317