thumbnails expected by default
implemented supports for tip timetolive
Merge branch 'master' into thumbnails-by-default

Conflicts:
	app/views/admin/receivers.html
	app/views/header.html
	app/views/submission.html
Merge pull request #44 from globaleaks/thumbnails-by-default

Thumbnails would be show.
Merge pull request #46 from globaleaks/feature/supports_cleaning

implemented supports for tip timetolive
updated "Source Code" link to https://github.com/globaleaks/GlobaLeaks
Merge branch 'master' into feature/overview
completed workflow of overview https://github.com/globaleaks/GlobaLeaks/issues/60 #43