Add a few more tests for Pixiv source redirection.
Add source redirection support for ugoira URLs.
Fix edit link being visible for active aliases/implications

They can't actually be edited unless they're pending
fixes #1473
Merge pull request #2290 from evazion/fix-ugoira-source-redirection

Fix ugoira source redirection
use 2 delayed_job workers
fixes #2291
Prevent ugoira page layout shifting

This puts the load progress in the same place as the seek slider so them
switching doesn't move around the bottom half of the page.
support for running ugoira conversion manually from console
fixes #2292
since ugoira converter always uses the md5 file path as the base, no longer have to delay unlinking the tempfile
hide ugoira preview/video link if it hasn't finished processing