Release 1.5.2 for Linux

Here are the changes we made the last weeks.

SliderEditor has been converted to bootstrap 3 carousel because of license issues.
News will be displayed on the dashboard now.
Additional files and folders under /content/* will also be copied to the deploy directory while building the site. This makes it possible to deploy for example robots.txt, google.html and other files.
The install directory can now be choosen prior to install FlatSiteBuilder
Added a warning when SiteWizard will override an already existing site