Support str type in email charset detection.
Merge remote-tracking branch 'refs/remotes/ivan/feature/support-str-in-charset-detection' into develop
Add Soledad invalid auth token event (#5191).
Merge remote-tracking branch 'refs/remotes/drebs/feature/5191_add-soledad-invalid-auth-token-event' into develop
Fold in changes
Merge branch 'release-0.3.7'
Merge tag '0.3.7' into deb-0.3.7

Tag leap.common version 0.3.7
update changelog to 0.3.7 final release
freeze debian ver to 0.3.7
bump standards-version