Show video more clearly through title
Use dark red for title text for better contrast
Rounded borders on vidoes
Pass first/last to page callback

This will be used to correctly disable/enable the prev/next links.
Disable prev/next links on first/last page
Use avconv to extract metadata

This means that we can extract metadata from all the file formats
supported by libav, not just mp4 files as before.
Remove unused placeholder thumbnails
Remove unnecessary quotes around object properties
Merge load_titles and load_thumbnails

The two functions were quite similar.
Shorten long line