add datepicker
Merge branch 'master' into timepicker
Merge branch 'timepicker'
moved edit button from list page to show page
Merge branch 'master' into development
general UI adjustments
WEB-54 – adhoc meetings implemented

o join.html.erb
	– handle if meeting is actually nil and set a notification form if so
o _header.html.erb
	– drop down menu for scheduling a meeting (standard + adhoc)
o meetings_controller.rb
	– extended notify method to handle adhoc meetings
Merge branch 'development' of github.com:TUD-KP-WebCall/WebCall into development