Fix stable/unstable list headers in 1.0 post

Add Prometheus 1.0 blog post

We allow millisecond durations.

Update blog for new group_left semantics.

Fixes #372

Explain how we handle strings.

Fixes #232

Mention proxy_url in the docs.

Document Azure SD

Fixes #352

Fixes #318

Exporters page: Add WebDriver exporter

Clarify that `deriv` is per-second.

functions: Clarify over-time semantics

Update FAQ on dashboards to reflect latest advice

Minor spelling fix for directly instrumented software

* Use d3 to handle keyboard event

jQuery isn't always being loaded before the
routing-tree script is executed.

We cannot guarantee when jQuery will be available,
but d3 will be loaded before the routing-tree
script. This change preserves the previous
functionality.

* Add simple case for handling fewer than 3 nodes

The tree algorithm being used doesn't properly handle 1 or 2 nodes.

Deleted leftover "e.g."

[docs] fix relabel default configs

operating/configuration: Remove kubernetes_sd_config kubelet_port

According commit [206bcfcd](https://github.com/prometheus/prometheus/commit/206bcfcdaac356e8bdb0cd91f3478f111eaa6d30)
kubeletPort config option was removed (release 0.20.0)

docs/alerting: update configuration docs

Merge next release doc into master

configuration: Update scrape config