Enable control over item virtualiztion in ListView: https://github.com/winjs/winjs/issues/577
 The ListView control does not expose any way for developers to control item virtualization. There are many scenarios where developers creating applications that are mostly composed of list experiences desire fine grain control over how items are virtualized.
Fix #643
toolbar minor css update
Merge branch 'master' into banguero/compact-mode-ellipsis
compact mode updates