[function] Support "delete note" function

Symptom: Support "delete note" function
Root Cause: NA
Solution: 1. When clicking "delete" button, buttons within the header block whould be changed to "cancel" and "ok".
          2. After selecting the items user wants to delete and clicking ok button, note data would be removed.
Project: MBNote
Note:

	modified:   css/index.css
	modified:   html/index.html
	modified:   js/index.js