feat(post): deis 0.11 release

Blog post and markdown content for release notes. Please review and suggest changes.

`author: gabrtv` assuming he is going to merge this tomorrow, copy the body content, remove the `<-- more -->` tag and post it as release notes here: https://github.com/deis/deis/releases/new?tag=v0.11.0 

Also make sure not introduce any newlines, since GitHub doesn't like those in markdown.