Fixes to support install dinamico-bundle on mvc4 and mvc5
Do not force sites already using MVC4 to upgrade to MVC5
Replace n2:h4 (which no longer exists) with n2:hn
Merge branch 'master' into restore-mvc4-5-support
Fixed upgrade sites using configSource
Merge branch 'restore-mvc4-5-support' of https://github.com/n2cms/n2cms into restore-mvc4-5-support
Fixed some H1-6 -> Hn