Updated security advice
Added style for admin area

Button colours and divs for past, present, and future participants
Made extractElement public

so that it can be called from outside the class
Removed [view | edit | delete] options

these options will be shown when you open the experiment details
Red delete button
Give button options for edit, close and delete
Added page includes
Changed layout of main page

to columns for open and closed experiments
New view layout

Layout produced in view.php rather than as a method in the Experiment
class. Time slots are broken up into past, present and future, and can
be revealed/hidden on click of title area.
Close page for closing an experiment