support dbootstrap (bootstrap for dojo)

[ebengtso]

Please add support to dbootstrap.

In order to support dbootstrap, replace img nodes in cbtreeNode.html with span nodes.

I havent tested the impact of this change to other themes.

cbtree is great!

[ebengtso]

never mind this. dbootstrap has a patch for dijit templates

https://raw.github.com/thesociable/dbootstrap/master/source/dbootstrap/icon_support.js