Convert the one BMP to GIF.

The latter is a standard web format and also smaller.
zIndex for emptyNode

set zIndex to 1
fix #12671 - Focus skip column header and row header when using Tab key
update test_grid_bar page to add case for empty Toolbar focus skip header and rowHeader issue
fix gridx fail to render when encode non-string column
Merge pull request #229 from junfengye/patch-2

zIndex for emptyNode
update dod test page
Merge branch 'master' of github.com:oria/gridx
fix #12051 - Bug: accessibility AA1.4.3 radio buttons changed into checkboxes in high contrast
code cleanup
for always editing, remove the call to _lockColumn when focus
iMerge branch 'master' of https://github.com/oria/gridx
fix typo
fix #12698 -  dijit/form/ComboButton Dropdown List Detaches from page when dialog close
remove hard codes for dijit/form/ComboButton because the implementation is bad
update cellwidget test page
fix #12775 - gridx dod has no way to open detail info by expando.
fix #234
update .gitignore
Merge branch 'master' of https://github.com/jsonn/gridx into jsonn-master

Conflicts:
	resources/claro/basic.css