col-md should add up to 12
Added Date- and TimePickers

Time is now saved as long in de database which is very extreemly ugly,
but so is javascript
time is Timestamp in DB, long in json
Fixed timepicker width

related: https://github.com/angular-ui/bootstrap/issues/2376
Removed 20px margin between date- and timepicker
Dropdown for coordinator for activity
html cleanup and small text changes
Include coordinator id in select
Dropdown for activity for activityinstance
Set no-cache to ALL responses
Cache setting can now be specified per method

Methods can be annotated with @NoCache for no-cache cache control header
or with @CacheMaxAge for a specific value for max-age.
Unannotated methods will get a max-age equivlent to 1 day.
Removed (commented out) some unnecessary imports
Fixed some html
Fixed things as requested
Merge branch 'pre-fup'

Conflicts:
	src/main/java/rest/TeachersResource.java
	src/main/webapp/css/style.css