Add "Switch to Debug Panel" menu choice to the Project Chooser "Admin"
menu. This menu is only shown to administrators and they can use it to
switch to the Debug Panel without an error having occurred.

Change-Id: Ifa913fd9d6530765c6bc8921130873f3ff143f32
Reduce spurious logging.

Reduce spurious logging in AssetManager.java. Put logging under a DEBUG
flag, default "false". Avoid the log messages every two seconds.

Change-Id: I77472f1c83eb1be629fbe005dbb68b184a657a4b
stop attempting to render blocks when not loaded

Change-Id: Id2ffc6801f242973c54d54eafd4bfbf01726ab36
changes name in the title of the browser tab

Change-Id: I74a690c5d3e5e6afdd421f2e0b30339d85b2a86d