Bug: the uploads page showed a remote size of 146 bytes for Pixiv uploads.
Cause: we didn't spoof the Referer header when making the HEAD request
for the image, causing Pixiv to return a 403 error.
Also fix the case where the Content-Length header is absent.
* Move the source normalization logic out of the post model
and into individual sources' strategies.
* Rewrite normalization tests to be handled into each source's test,
and expand them significantly. Previously we were only testing
a very small subset of domains and variants.
* Fix up normalization for several sites.
* Normalize fav.me urls into normal deviantart urls.
Fix the moebooru strategy to fallback to returning the image url if we
can't find the preview url. Fixes iqdb lookups failing in some cases
because the strategy didn't return a valid url for preview_url.
* Normalize spaces to underscores when saving other names. Preserve case
since case can be significant.
* Fix WikiPage#other_names_include to search case-insensitively (note:
this prevents using the index).
* Fix sources to return the raw tags in `#tags` and the normalized tags
in `#normalized_tags`. The normalized tags are the tags that will be
matched against other names.
If the yande.re or konachan.com post has a source from a supported site,
for example Pixiv or Twitter, then delegate the artist and commentary
lookup to that substrategy.
Only do this for sources from recognized sites, not the null strategy.
