Remove modernize local provisioner/consistent IP, check off localized output, and add workflow for k8s dev

Adding priyawadhwa as minikube approver

small travis test changes

Add instructions for including supporting documents with MEP proposal

Remove heapster addon

Silence virtualbox registry check

Store kubernetes clientset when waiting for apiserver

update releases.json to include v1.5.2

fix cron script installation

Fix spelling of HTML for golint on bindata

Reportcard again, golint and gocyclo.

Supposed to be removed in 361222f6, along with
some other random changes to comments and such.

update examples to use "kubectl create"

While looking at pprof data, I noticed that the line:

```go
client, err = k.client(k8s)
```

takes around .9 seconds to complete. Previously, we were calling it on
every iteration of the waitFor loop. Instead, if we store the clienset once
we have it, we should be able to speed up this function.

During local testing, this optimization reduced time spent waiting for
the apiserver by 13 seconds on average.

Disable brew cask updater

Version bump to v1.5.2

Allow CPU count check to be disabled using --force

Make network validation friendlier, especially to corp networks

Avoid the s3 and gcs protocol handlers in go-getter

service: fix --url mode, add integration tests

Fix pod list retry, reset start timer