updated search method
Merge branch 'parser'
Added assertion to undo and redo methods
task comparator modified
borderless GUI almost done: non-resizable, can close and drag around but cannot minimise -.-
solved the problem of minimising the window^^ can use PgUp and PgDn to scroll and Esc to minimise window
implement help page, but need to update/change design later
fix minor bug of hotkeys
Merge branch 'UI'
Merge pull request #87 from cs2103aug2014-w15-3J/master

Merge LogicThird with Master