Merge branch 'release-0.5.4' into trunk

* release-0.5.4:
  Bumped version to 0.5.4 in preparation for release
  Changed support email to Michael Kuck
Fixed memory leaks in mysql connections
Temporarily disable database version caching
Refresh database version every minute (if requested)
Merge branch 'trunk'

* trunk:
  Refresh database version every minute (if requested)
  Temporarily disable database version caching
  Fixed memory leaks in mysql connections