Fix 404 errors when there is no app config file

Refs #3160
Fix audio tag looping in nodejs

Refs #3161
Fix infinite redirect for unsupported browsers

Refs #3143
Feedback from peer review

Refs #3143
Merge pull request #119 from virtual-world-framework/branch/nodejs-misc-fixes

Branch/nodejs misc fixes

Fixes #3143, #3160, #3161