Force django-reversion version to 1.8.0.

fix #558
Manually close db connections inside management scripts.

fix #557
Documentation update.

fix #555
Documentation update.

fix #555
Merge branch '1.1.x'
1.1.3 release.
Merge branch '1.1.x'
Update web_servers.rst
Merge pull request #559 from gt2a/patch-1

Update web_servers.rst
Release 1.1.4
Merge branch '1.1.x'
Merge branch 'master' into feature/radicale