* [stable/concourse]web and worker assigned specified node with nodeAffinity
* [stable/concourse] web nodeport fixed if web.service.type is "NodePort"
* [stable/concourse] nodePort and nodeAffinity default value set
* [stable/concourse] modified README
* [stable/concourse] version increment
* take in https://github.com/kubernetes/charts/pull/2063#discussion_r143343633
* modified values.yaml
* modifed typo in web-svc.yaml
* web nodeAffinity parameter change to additionalAffinities (https://github.com/kubernetes/charts/pull/2300)
* add web.additionalAffinities comment to value.yaml
* modified README.md
* modified comment indent