Check for error code zero or greater.
Issue 167 - Limit add/checking for specific users
issue168 - windows likes realpath better for certain things
Merge branch 'master' into develop
issue167 - added installation/upgrade logic. Fixed an issue with new users not getting the new flags enabled by default.
Merge branch 'feature/issue167-limit-add-access' into develop
Merge branch 'samwilson-error-code' into develop
Merge branch 'release/1.2.8'