Setup Open Census Exporter

Merge pull request #105 from heroku/ffz/AddOCToCmdutil.Service

Add Open Census agent exporting to the Service.

grpc-gateway and rollrus updates

Bumps versions of grpc-gateway (#101) and rollrus (#103).

Fixes bug with logplex/encoding parsing

logplex/encoding: fix version and priority (#100)

== Context

We were previously using the Priority field as the Version output. This
manifests as messages with `<190>1` prival as being converted to
`<190>190`.

grpcclient: Patch to include AppendRequestID

v0.0.8

grpc: Re-adding Request-ID middleware (#92)

logplex/encoding: Updated implementation

Merge pull request #78 from heroku/lxf-lpx-lol

logplex: relaxing parser

cmdutil: libraries for aiding in building cmd binaries

Enable stylecheck and missspell (#83)

* enable misspell and fix (automatically) misspellings.

* stylecheck errors

```console
$ make lint
/Users/emuller/devel/x/.tools/golangci-lint run --fix
cmd/s3env/main.go:145:26: ST1005: error strings should not be capitalized (stylecheck)
                        return nil, fmt.Errorf("Unable to parse %s. Make sure it's of the format KEY=VAL", v)
                                              ^
grpc/grpcclient/h2c.go:27:26: ST1005: error strings should not be capitalized (stylecheck)
                        return nil, fmt.Errorf("Error determining default port for scheme %s", ou.Scheme)
                                              ^
hmetrics/hmetrics.go:116:19: ST1005: error strings should not be capitalized (stylecheck)
                        Err: errors.New("Empty string"),
                                       ^
make: *** [lint] Error 1
```

Adds tlsconfig ciphers and PKI related functionality

tlsconfig: add preconfigured ciphers (#76)

* tlsconfig: add preconfigured ciphers

== Context

Adds modern, legacy, and strict cipher selection. Useful for some canned
set of good defaults

* Adds pki stuff

Adds acm middleware

hmiddleware: add acm (#73)

This middleware is useful for implementing the heroku ACM specific
contract for redirecting to the origin ACM servers.

Customers shouldn't need to use this if they're just leveraging the
platform normally -- but is more for fringe cases.

testenv: Saner defaults

Allows saner defaults for testenv Redis and postgres, favorable for local development.

more libraries added

• sharder
• logplex/encoding
• hmiddleware/httpmetrics
• basicauth

And much more!