Bump to v0.7.0.alpha.7

* "bosh show cf properties" shows attrs [fixes #183]
* ReleaseVersions determine mutable/immutable attrs
* spec for DeploymentAttributes default values
* validate DNS -> IP mapping
* Show num of vms in deployment sizes [fixes #180]
* Downgrade core/0 to an m1.small [closes #179]
* There may not be support for changing between deployment sizes
* remove some unrelated readme
* add waffle.io badge
* Document bosh-bootstrap & initializing CF