Mod: new edit interface for dashboard layout
Add: draggable widget
Mod: draggable widget
Mod: delete debugger
Mod: add widget
Mod: refresh widget after edit

Mod: refresh widget when widget settings change
Fix:  Number Widget && Donut Widget  — det is infinity sometimes
Del: delete log
Fix: record push bug

bug info: server will send 400 when value is 0
FIX: jshint
Merge pull request #51 from slycloud/master

Mod: new management interface for dashboard layout