Merge pull request #65 from aheusingfeld/master

Fix for #58
Merge pull request #67 from aheusingfeld/master

reverted host name which was changed for local testing
Merge pull request #68 from aheusingfeld/master

Fix for #58: further UI modifications
Let's do away with the top level menu and see what happens.
Update README.md
fix #66: add confirm dialog for deletion
Add image preview #70