Merge pull request #395 from rjnagal/docker

Don't use state.json from libcontainer to get cgroup paths.
Release 0.7.1.
Merge pull request #396 from vishh/0.7.1

Release 0.7.1
Re-word to fix a hanging sentence.

Can we just remove this? We moved our base requirement to Docker 1.0. Is this fixed there?
Merge pull request #399 from rjnagal/docs

Re-word to fix a hanging sentence.
Skip ROM devices in disk map.
Merge pull request #401 from rjnagal/docs

Skip ROM devices in disk map.
Add ethernet devices information to machine endpoint.
Merge pull request #402 from rjnagal/diskinfo

Add ethernet devices information to machine endpoint.
Refactor common methods out of sysfs package and add tests.