…index.html.

…ix-LiveDevMultiBrowser-loop

* commit 'bb4f4d0fdaae509cafd467364947717f0c70cb4d':
  LiveDevMultiBrowser should properly search parent directories for an index.html.

…iveDevelopment.js,

moving shared code to FileUtils with unit tests. Also...
- fixes an unhit edge case in getParentFolder() (now getParentDirectory())
that behaves differently across platforms
- removes duplicate copy of getFilenameWithoutExtension() in LiveDevelopment.js
(copy in FileUtils was identical)
- add/fix some unit tests for two existing FileUtils APIs