A lot of changes
Complete HelpHandler
Changed numbering to use brackets instead of dots.

From
1. <Task Name>
2. <Task Name>

To
[1] <Task Name>
[2] <Task Name>

#56
Removed Exception from `displayResult(Result result);`
Handled exceptions thrown from logic
Merge remote-tracking branch 'origin/ui/victor' into controller/sharon
Merge remote-tracking branch 'origin/logic/wenhao' into controller/sharon
Passed command to logic function calls