Tab#write always overwrites, no need to unlink
Replace files atomically when relocating
Drop intermediate variable
Replace files atomically in inreplace
openssl: use atomic_write to install cert file
curl 7.36.0
boot2docker 0.7.1

Closes #27894.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
gringo: fix build on pre-10.9 clang
gringo: upstream patch to build on FSF GCCs
gringo: update 4.3.0 bottle.