update invigilator pom.xml
Invigilator login page
ViewController override open, close, and error method. No need to override again.
remove useless method.
Merge branch 'Ciel/FixConnector'
Add getScene method into Director class.
Merge branch 'master' into HomeView
use static stage and scene in Director class.
Merge branch 'master' into HomeView
Implement add component method!!!!
Add grid pane into Course View.
dynamic add button on CourseView.
Add button styles.
fix location and width problem.
Merge branch 'HomeView'
use run later to replace old pushStageWithFXML method.
remove nextView method and pushStageWithFXML now does not need runLater any more.
Merge branch 'Director'
test1 & test2