only call deleteLater for linkedData if we have a QCoreApplication instance
only attempt to deleteLater on linkedData if it exists
Merge branch 'master' of github.com:worklist/hifi into assignment
Merge pull request #1214 from birarda/assignment

fix for deleteLater on Node linkedData
fix thread contention issues and VS crash on domain server shutdown and restart
removed dead comment
Merge pull request #1215 from ZappoMan/bugfixes

fix thread contention issues and VS crash on domain server shutdown and restart
Merge pull request #1213 from birarda/master

temp remove audio from agent, mutate GOL placeholder
fix for AC lack of QCoreApplication