Bug 914138 - refactor some code, append to the overflowable toolbar in the right spot if necessary, r=jaws
Bug 914138 - test scaffolding fix, minor overflow checking issue, r=jaws
Bug 914138 - add the toolbar as a listener, and do bookkeeping for inserted/removed nodes, r=jaws
Bug 914138 - add a test for the overflow panel insertion/additions, r=jaws