in event controller: 1. time input is more user friendly, but should be
  					    more easier if good timepicker is used. have
  					    included the timepicker gem, may implement it later.
  					 2. now can choose event type in a dropdown menu list
still working on:    1. event show layout, haven't got the slider work
 						yet
 				     2. events index page needed to be improved
 				     3. the event status, will do it later
hard problem:        1. how to add jquery styling on file_field, have
   						tried it before, but the .button has also covered
   						the words "attach file", which shouldn't be like
   						that.