de-utilized navig buttons and abstracted out some constants
modified logger, now with 2 lines of display
added feedback message box and coupled to console. function to be integrated soon.
integrated feedback box and improved the help texts
Merge branch 'master' of https://github.com/cs2103aug2014-f10-1j/main
framework for done/ongoing/overdue icons up!
solved issue #55 and #56
added framework for rank icons. waiting for the actual icons now #58