Removes visibility fix for user navigation visible property
propogation issues since visible property propogation issues have
been eliminated due to previous changes.

Fixes #2644.
0.6.15 Cutover
Command Center Texture Update for backboard. Fixes #2668
Wait for the application node to load before initializing the view.

The HTML overlay previously loaded whenever it was ready, some time
after starting construction of the application tree. Some child nodes
may have already been contructed by that point, depending on timing and
whether or not they were contained in the application's component and
had other dependencies.

As of commit:12c139f, the application waits for the overlay to load
before continuing past the application root.

The tile puzzle was expecting certain child nodes to exist immediately
after the overload loaded. The fix is to wait for the application to
load (to receive `initiaizedNode`) before interacting with it.

Fixes #2720.
Merge pull request #17 from virtual-world-framework/branch/issue/2720

Wait for the application node to load before initializing the view.
Command Center board_images1.DAE fix.  Changed the path of the imported png.  Refs #2668
Merge pull request #16 from virtual-world-framework/commandcentertextureupdate

Command Center Texture Update for backboard. Fixes #2668
Merge branch 'integration' into branch/persistence-docs