Merge pull request #349 from vmarmol/systemd

Try to detect systemd by checking for its named cgroup hierarchy.
Bump minimum docker supported version to 1.0.
Merge pull request #353 from rjnagal/version

Bump minimum docker supported version to 1.0.
Add a validation handler to check cadvisor's underlying dependencies.
Merge pull request #351 from rjnagal/validate

Add a validation handler to check cAdvisor's underlying dependencies.
Match Filesystem listing with Filesystem Gauge name.
Both are now FS #n.
Merge pull request #354 from rjnagal/version

Match Filesystem listing with Filesystem Gauge name.
Fix Docker handler for machines that use systemd just as a naming service without controlling cgroups.
update libcontainer to v1.2.0-173-g58fc931
update to support newest libcontainer update
Merge pull request #355 from rjnagal/syst

Fix Docker handler for machines that use systemd just as a naming service
Add systemd information to validate output.
Merge pull request #356 from rjnagal/rename

Add systemd information to validate output.
Final changes to circular buffer
Merge pull request #350 from kateknister/master

Changed memory storage to a circular buffer
Generate CgroupPaths when not available.

This happens always for non-Docker containers and sometimes with older Docker
containers.
Merge pull request #358 from vmarmol/update-libcontainer

Update libcontainer dependency
fixed typo in influx docs
made storage table names configurable
Dynamically create the filesystem usage.

Fixes #357.