Update .travis.yml by adding a submodule.
Drop the symlink.  Travis can't submodule.
Update submodule URL for travis.
Drop symlink again.
Update .travis.yml file
update python ebuilds with proper variable usage
dev-python/pycallgraph: simplify dependency strings
dev-python/pycallgraph: update Manifest
Merge branch 'master' into app-emulation/cloud-init
app-emulation/cloud-init: drop unnecessary variables