fixes to the JARFleMaker class - skip files that we don't have permissions to read, and write a warning + stack trace to the log. fixes #861
Merge pull request #862 from Microsoft-CISL/sergiym_jarmaker_fix

skip files that we don't have permissions to read, and write a warning + stack trace to the log
Fixed the default behavior on client close

The `DefaultClientCloseHandler` should throw an exception, but did not. Now it does.
Merge pull request #863 from Microsoft-CISL/weimer_defaultclientclosehandler

Fixed the default behavior on client close
Merge branch 'master' of github.com:Microsoft-CISL/REEF into sergiym_refactor_failing_dl