Fixed Dockerise to Dockerize

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Replaced all double backticks in README with singles

Docker-DCO-1.1-Signed-off-by: James Turnbull <james@lovedthanlost.net> (github: jamtur01)
Merge pull request #5416 from jamtur01/dockerize

Fixed Dockerise to Dockerize
Merge pull request #5417 from jamtur01/readme3

Fixed double backtick to single backtick formatting issue in README
Freeze ./integration and explain where to contribute new tests

Docker-DCO-1.1-Signed-off-by: Solomon Hykes <solomon@docker.com> (github: shykes)