Sort groups with explicitly-specified items, too.
Inform the user of tile failures and hide item.

Fixes #381
Merge pull request #459 from NICTA/sortExplicitGroups

Sort groups with explicitly-specified items, too.
Merge pull request #460 from NICTA/handleTileFailures

Inform the user of tile failures and hide item.
Clean up main.js.
Fix jshint warnings.
Lots of startup improvements.
Use new geoserver for Broadband catalog items.
Add underscores to Broadband layer names.
Passed tiled=true to Broadband WMS servers.
Merge pull request #463 from NICTA/mainCleanup

Initialization cleanup
Merge remote-tracking branch 'origin/master' into newBroadbandServer
Merge pull request #465 from NICTA/newBroadbandServer

Switch over to the new Geoserver for the Broadband datasets.
Use the Geoserver-provided legend for "Broadband Map".
Merge remote-tracking branch 'origin/master' into newBroadbandServer
Merge pull request #466 from NICTA/newBroadbandServer

Use the Geoserver-provided legend for "Broadband Map".