app-emulation/docker: bump to docker 1.0.1
app-emulation/docker: add LimitNOFILE=1048576

Default to having a high file number limit this can be troublesome[1]
but most containers a based on a new enough glibc that this is OK.

[1] https://github.com/dotcloud/docker/issues/6560
Merge pull request #695 from philips/bump-docker-fileno

docker: bump to 1.0.1 and increase LimitNOFILE