1.fix bar.data() not save false in localstorage
2. change all const back to var
3.Helperbar: the initinalization will check whether <body> tag is existed
or not, if yes, append to the body tag, if not waiting for the document
loading finished.
1.use jquery 1.8.0
1. update demo.js
1.fix data() did not save false value.
2.use good prastice to wrap the window and undefined
Merge branch 'v0.4.x'

Conflicts:
	menubar/HelperBar.js
*update to v0.4.1b
* update to v0.4.1
1.add test script (qunit + testem)