Deis Workflow End-to-End Tests v2.7.0

v2.6.1 -> v2.7.0

Features

• 874c9e0 label-cmd: add Label cmd

Documentation

• 1f60736 README: swap out helmc for helm installation instructions

Maintenance

• 5ed663b apps_test: Fix up logger tests for new log format
• 96c5779 Dockerfile: bump deis/docker-go-dev to 0.19.0 (#336)
• f9cbec4 Dockerfile: bump kubectl version