[FEATURE] Support to lock web pages opened if the limited time runs out

[sheepzh]

问卷星 No.25

• Implement a monitoring center registering with all rules
• This monitoring center will notify all tabs that meet the url condition when the convenience value of rule is reached

[sheepzh]

• Notify other pages to unlock if the user click 'More 5 minutes' in current tab.

[sheepzh]

• Notify other pages to unlock if the user click 'More 5 minutes' in current tab.

Trace it in new issue #82