Bug ZSS-755: Press minus key, '-', cannot enter editing mode in a cell under firefox
Bug ZSS-710: When rename sheet, cannot press "Delete" key to delete a character
Merge pull request #55 from jerrywell/ZSS-710

Bug ZSS-710: When rename sheet, cannot press "Delete" key to delete a ch...
ZSS-755: Merge branch '3.5' of github.com:jerrywell/zkspreadsheet into jerrywell-3.5

Conflicts:
	zkdoc/release-note
Merge branch 'jerrywell-3.5' into 3.5
enhance selenium test