Add explicit method return types in header to supress warnings when including framework in projects with more exacting warnings such as -Wextra.
Merge pull request #240 from ryanmaxwell/master

Correct build warnings for 3 issues - detailed in each commit
Merge pull request #229 from mugginsoft/master

Hush method return type warnings when importing SUUpdater.h
Release notes referenced by URL in updates item description field can be delivered via https://
Fixing issue with update as non admin user where the quarantine flag did not get correctly removed from new application