* Add script for pushing container images via Travis
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Explain the latest tag logic
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Add travis integration to deployment

* ensure $BRANCH is always the same value (borrowed from Sonobuoy)
* get gcloud SDK installed (borrowed from Sonobuoy)
* use deploy step to run GCR push script (borrowed from Sonobuoy)
* use gcloud's docker to do the image building/pushing
* placeholders for secure values
* rename $LATEST to $HIGHEST to more accurately reflect what it is
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Add encrypted GCR creds
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Remove unused env section
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Rearrange logic so that there's only one make call
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Review feedback
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Update gcloud and OS for Travis environment
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Remove redundant make dependencies

verify and test targets already run on the ci target, which must pass
before deploy.
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>

* Re-encrypt file after testing
Signed-off-by: Nolan Brubaker <brubakern@vmware.com>