Refactoring lists to use generic box list element.
box-list element can be a selector as well. Refactored upcoming slots to use a non-selector box-list.
Refactored tick list to use box list element.
Refactored people list to use box-list element.
Merge branch 'master' of github.com:ucam-cl-dtg/urop-2014-ticking-ui
Merge branch 'master' of github.com:ucam-cl-dtg/urop-2014-ticking-ui