add allowHighResDownload
Merge pull request #896 from nla/js-dsc-105

add allowHighResDownload
Merge remote-tracking branch 'origin/master' into dsc-1279
Fix showChildren.
Barf when null is passed.
passing ead error msg to browser.
Merge remote-tracking branch 'origin/master' into dsc-1279
Merge remote-tracking branch 'origin/dsc-1279' into dsc-1279