fix a bug demostrated in TestPercentilesSmallDataSet()
Revert to ubuntu-trusty for lmctfy-docker image.

Lmctfy needs libprotobuf8.

Fixes #23
Merge pull request #27 from monnand/bug-fix

fix a bug demostrated in TestPercentilesSmallDataSet()
Merge pull request #29 from vmarmol/fix-dockerfile

Revert to ubuntu-trusty for lmctfy-docker image.
Fixed typos
Move to using the libcontainer repo directly.

Return empty stats for / and /docker in the docker driver
Merge pull request #31 from pborreli/typos

Fixed typos
Merge pull request #32 from vmarmol/switch-libcontainer

Move to using the libcontainer repo directly.