Fix use case where base URL is specified after live preview open starts.
back out fix for #4265 and related follow on bugs

remove jshint boss option

restore appshell menu check
Merge pull request #4370 from adobe/jasonsanjose/issue-4369

back out fix for #4265 and related follow on bugs
Merge pull request #4367 from adobe/jasonsanjose/4366

Fix use case where base URL is specified after live preview open starts.