Merge pull request 'Check whether data is parsable by 'imagecreatefromstring' in jimIcon.' (#7) from wn/tt-rss:jimIcon-imagecreatefromstring into master

Reviewed-on: https://git.tt-rss.org/fox/tt-rss/pulls/7

Merge pull request 'Let 'RSSUtils::check_feed_favicon' update existing favicons.' (#6) from wn/tt-rss:check-feed-favicon into master

Reviewed-on: https://git.tt-rss.org/fox/tt-rss/pulls/6

Merge pull request 'Open the default feed after unsubscribing' (#5) from wn/tt-rss:bugfix/post-unsubscribe-feed-selection into master

Reviewed-on: https://git.tt-rss.org/fox/tt-rss/pulls/5

Previously the UI appeared to hang, even though the backend request had already completed successfully.