proxy_resolvers
range cache: and buffering cache for serving range requests, intended
for videos but not only. full response cached in temp file and range
requests served from cache, still experimental
need to add deletion.
youtube_dl: wrap youtube-dl import due to youtube-dl HTMLParser regex
bug
tests: add test for vi_ handler
canonical, no-modifier archival url (instead of mp_).
When using frames, the page redirects to a 'tf_' page, which then uses
replaceHistory() to change url back to canonical form.
memento: support for framed replay, include memento headers in top frame
bump version to 0.6.2