[20160615213630] General Rack Improvements

Improve rack operations

This enhancement addresses issues where a rack name could be used in the context of an app name. The fix includes better error handling to let the user know what exactly is going on.

For more information see PR #764 and #767

Bug Fix

For a small time window, limited set of users experienced an issue where they weren’t able to deploy their apps. This fix address the problem by using GNU tar during builds.

For more information see PR #769 - Use GNU tar for builds