Merge remote-tracking branches 'origin/pending-proc-macro-hack', 'origin/pending...

Merge remote-tracking branches 'origin/pending-proc-macro-hack', 'origin/pending-sloppy-rfc4880', 'origin/pending-endian-type', 'origin/pending-mio-named-pipes', 'origin/pending-nibble-vec', 'origin/pending-cookie', 'origin/pending-cssparser', 'origin/pending-antidote', 'origin/pending-bs58', 'origin/pending-tinytemplate', 'origin/pending-unicode-categories', 'origin/pending-security-framework-sys', 'origin/pending-rand-xoshiro', 'origin/pending-errno', 'origin/pending-kamadak-exif', 'origin/pending-diesel-derives', 'origin/pending-curl-sys', 'origin/pending-data-encoding', 'origin/pending-curl' and 'origin/pending-cast'