polish pref to back
Remove empty line of logs.
Polish log replace logic.
Merge pull request #22 from ivanzhaowy/master

Remove empty line of logs.
Merge remote-tracking branch 'wandou/master'
Polish task item time visualisation.
fix edit module and add limit in task module
Merge pull request #23 from ivanzhaowy/master

Polish task item time visualisation.
Merge remote-tracking branch 'wandou/master'