Delete Dockerfile & related files
update README to redirect docker responsibility

closes #647
upgrade strider-cli to close #630
Merge pull request #665 from Strider-CD/647_kick_docker

Remove direct Strider-in-Docker support
Add additional config section
Fix additional configs
Move requireing strider & heroku advanced to wiki
Move managing plugins to wiki
Remove plugin specific envs, fix up others
Allow deploy/test for master-like branches

not customized, that is
Merge branch 'master' of https://github.com/Strider-CD/strider
Remove unused express-namespace