Add left-margin to tree labels - PMT #107895

[nikolas]

[nikolas]

This is failing due to a travis issue: travis-ci/travis-ci#7987

W: http://dl.hhvm.com/ubuntu/dists/trusty/InRelease: Signature by key 36AEF64D0207E7EEE352D4875A16E7281BE7A449 uses weak digest algorithm (SHA1)
W: http://ppa.launchpad.net/couchdb/stable/ubuntu/dists/trusty/Release.gpg: Signature by key 15866BAFD9BCC4F3C1E0DFC7D69548E1C17EAB57 uses weak digest algorithm (SHA1)
E: Failed to fetch https://debian.neo4j.org/repo/stable/Packages.gz  Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead.

tests can be run locally to be verified - this would really only affect eslint, which passes with this change.