Update SimulationController.java

Cleaned and optimized addRandomizedScenario() method 
Removed readCore() method (moved to addRandomizedScenario())
Submitting some changes: reordered tabs, display JCAHO rules differently, turn off double clicks, fixed typos, removed a note, add confirmation for deleting a narrative, submit button returns to scenario selection, clicking start displays the time allowed to complete the scenario
Merge pull request #17 from elimin8er54/patch-3

Update SimulationController.java
Merge pull request #18 from sadasilva/master

Changes made
Merge pull request #19 from jkuk/master

Ketty's changes
changes to: SimulationController, LoginGUI, SimulationManager. Updated the student password management system. removed the annoying log in pop up.