LB-605: Internal Error 500 happens when collaborator tries to delete image from Media Archive

Use same url to delete different types of media.
Merge pull request #186 from petrjasek/lb-images

LB-605: Internal Error 500 happens when collaborator tries to delete ima...
LB-658: Embed URL ->stt theme -> Share and Permalink hyperlinks are mostly NOT clickable on all browsers and devices

Set margin instead of padding for content.
Merge pull request #193 from petrjasek/lb-658

LB-658: Embed URL ->stt theme -> Share and Permalink hyperlinks are most...
Merge remote-tracking branch 'sourcefabric/liveblog-14' into liveblog-15