Merge branch 'release-0.5.4'

* release-0.5.4:
  Bumped version to 0.5.4 in preparation for release
  Changed support email to Michael Kuck
  Temporarily disabled keyword caching as for now it was a huge memory leak without even being used
Merge branch 'trunk'

* trunk:
  Refresh database version every minute (if requested)
  Temporarily disable database version caching
  Fixed memory leaks in mysql connections
Forgot to update version number for release
Merge branch 'master' into trunk

* master:
  Forgot to update version number for release