Merge branch 'logic/wenhao'
Merge branch 'logic/wenhao'
Done tasks not shown unless search --tag done.
Merge branch 'master' into logic/wenhao
ShowHandler now extends handler
HelpHandler now extends handler. Minor change in ShowHandler
Refactor Handlers
Help works. Minor bug fix.
Append \n to MSG
[dirty commit] dun merge
Get Relative index work except delete all
fix start&end time in reverse order bug
accepts "show today" command
update collation tag
delete toString from Command
disallowed show today
removed test case for show today
Abstract code
Change variable name
Abstracted more code