Add cross-compilation testing to .travis.yml

Docker-DCO-1.1-Signed-off-by: Andrew Page <admwiggin@gmail.com> (github: tianon)
Merge pull request #60 from tianon/cross-travis

Add cross-compilation testing to .travis.yml
Basic version of libcontainer API.

This version has mostly the behavior available today and the
functionality agreed upon in other PRs. Further changes will be sent as
smaller PRs for discussion.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Update api proposal

Move concepts into specific files for easy management
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)

Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: vmarmol)
Add a cleanup method to cgroup fs. This will help in building a
standalone cgroup test util. systemd does auto cleanup on empty, so
doesn't need an extra interface.

Docker-DCO-1.1-Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
Merge pull request #74 from rjnagal/cgroup_testing

Add a cleanup method to cgroup fs. This will help in building a
Merge pull request #67 from vmarmol/api2

Basic version of libcontainer API.
Ignore stats that are not available

Closes #13

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Merge pull request #75 from vmarmol/fix-stats

Ignore stats that are not available
Adding Initialize() to create a new container.

Docker-DCO-1.1-Signed-off-by: Victor Marmol <vmarmol@google.com> (github: vmarmol)
Rename package correctly so the binary is nsinit
Docker-DCO-1.1-Signed-off-by: Michael Crosby <michael@docker.com> (github: crosbymichael)
Merge pull request #78 from crosbymichael/rename-nsinit-main

Rename package correctly so the binary is nsinit
Merge pull request #76 from vmarmol/api-init

Adding Initialize() to create a new container.
Cleanup checks for non-existent cgroup file to be concise.

Docker-DCO-1.1-Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
Merge pull request #80 from rjnagal/cgroup-cleanup

Change checks for non-existent cgroup file to a more concise form.
Allow caller to change the labels on a directory tree.

We want to add this to libcontainer so that we can change docker so that
when you volume mount into a labeled container, we want to allow the
administrator/user the ability to tell docker to fix the labels on the mount.

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)