Install lxc explicitly

As of lxc-docker-9.0, the lxc package is no longer installed on Ubuntu.
Added major *scheduler* branch to Travis CI.
Reimplemented `deis shortcuts` command.
Merge pull request #676 from opdemand/travis-scheduler-branch

Added major *scheduler* branch to Travis CI.
Merge pull request #677 from opdemand/deis-shortcuts

Reimplemented `deis shortcuts` command.
Merge pull request #672 from opdemand/carmstrong/install_lxc

fix(builder+contrib): install lxc explicitly
fix(logger): update rsyslog repo endpoint

ubuntu.adiscon.com has moved to launchpad.
Merge pull request #681 from opdemand/rsyslog-repo-update

fix(logger): update rsyslog repo endpoint
docs(chef): update for the new manage.opscode.com

Deis docs' current reference to https://manage.opscode.com/groups/admins/edit for hosted Chef is now invalid since their web UI was updated. This corrects references to that and to preview.opscode.com, and makes clear that the client is named "deis-controller-ec2" on EC2.
Merge pull request #682 from opdemand/update-chef-admins

docs(chef): update for the new manage.opscode.com
first round of scheduler refactoring, with all tests passing

 - add concept of cluster for external job scheduling
 - first pass at new container api with mock scheduler
 - simplify build + config = release
 - deprecate configuration management and provider packages
 - deprecate node management features (formation/layer/node/provider/flavor)
adapt web app to new cluster domain object
remove deprecated cm and provider packages from test and coverage
wip on client changes for scheduler branch
remove slug metadata from builder
first pass at deis meta project
add deis meta project to root makefile
print only app name on list
prototype coreos scheduler implementation

Note an SSH wrapper is used to get around fleetctl ssh-agent requirement.  We will ultimately want to transition to an HTTP API for talking to fleet.  Until then, we should explore modifying fleetctl to remove the ssh-agent requirement for tunneling.
improve build + config = release

- add release version as header on build and config creation
- provide dynamic output on build/config CLI, including resulting release
- add `deis push` CLI shortcut for builds:create