Merge pull request #152 from edchat/master

Fix main.js it needed the require for domAttr, and ScrollableTestApp views had problem adding rows after change to this.app.
Merge pull request #153 from edchat/master

Fix ScrollableTestApp2 views there was a problem adding rows after change to this.app.
Merge pull request #154 from edchat/master

Update the layout support to take a "-" to indicate that a view should be removed (or hidden).