Fixed space-after-colon.
Merge branch 'master' of https://github.com:443/cs2103aug2014-w11-1j/main.git
Renamed variables to non-single-letter names.
Allowed show and edit commands from user, their implementations are not
yet complete, though.
Added an INVALID_COMMAND type of Result, removed unused imports.
Added InvalidCommand class, added its implementation to
CommandController too.