Updated nginx to 1.7.12.

library/nginx

@@ -1,6 +1,6 @@
 # maintainer: NGINX Docker Maintainers <[email protected]> (@nginxinc)
 
-latest: git://github.com/nginxinc/docker-nginx@e9202a4795d84a85499fcd6cda58ddde4cf4079d
-1: git://github.com/nginxinc/docker-nginx@e9202a4795d84a85499fcd6cda58ddde4cf4079d
-1.7: git://github.com/nginxinc/docker-nginx@e9202a4795d84a85499fcd6cda58ddde4cf4079d
-1.7.11: git://github.com/nginxinc/docker-nginx@e9202a4795d84a85499fcd6cda58ddde4cf4079d
+latest: git://github.com/nginxinc/docker-nginx@abd253dde5d627b151cd737ce953d6d01e6fdf4c
+1: git://github.com/nginxinc/docker-nginx@abd253dde5d627b151cd737ce953d6d01e6fdf4c
+1.7: git://github.com/nginxinc/docker-nginx@abd253dde5d627b151cd737ce953d6d01e6fdf4c
+1.7.12: git://github.com/nginxinc/docker-nginx@abd253dde5d627b151cd737ce953d6d01e6fdf4c