Issue #13. Respect global configuration for HTTPS connection check

If no configuration for repository was set use global Stash URL to check whether HTTPS should be used.
Issue #13. Mark checkbox as checked in global configuration
Issue #13. Relying on automatic data binding to set/get field values in global configuration
Merge pull request #35 from resah/issue_13

Thanks for following up @resah and sorry for the late reply.