Upstream changes
- Merge branch 'master' of git.tt-rss.org:tt-rss/tt-rss
- fix cleanup_feed_icons unlinking nonexistant files, limit it to actual feed icons
- Merge pull request 'Consistently get the self URL.' (#92) from wn/tt-rss:bugfix/config-self-url-consistency into master
- Consistently get the self URL.
- get_self_url: strip all trailing slashes
- DiskCache: enforce basename() on filenames passed to cache adapter