test(integration): add an app deploy test for `deis pull`
docs(README.md): clarify current release and encourage use of master
Merge pull request #1572 from deis/doc-current-version

docs(README.md): clarify current release and encourage use of master
Merge pull request #1559 from deis/1434-test-deis-pull

test(integration): add an app deploy test for `deis pull`