Additional Node HTTP Endpoints

# Overview

edited 5/30/19

A high priority TODO is migrating the RPCs to HTTP to allow for more flexibility. This should be fairly straight forward to accomplish since most of the code has already been written and just needs to be adapted to using the HTTP resources instead of the RPC resources.

# Proposal

Additional Endpoints to be added:

| RPC | HTTP |
| ------------- |:-------------|
| `getnameinfo` |`GET /name/:name` |
| `getnamebyhash` | `GET /name/hash/:hash` |
| `getnameresource` | `GET /resource/name/:name` |
| `getnameresourcebyhash` | `GET /resource/hash/:hash` |
| `getnameproof` | `GET /proof/name/:name` |
| `gtetnameproofbyhash` | `GET /proof/hash/:hash` |
| `grindname` | `GET /grind?size=int` |

`sendrawclaim` already is implemented as `POST /claim`

This work has been started here:
- https://github.com/tynes/hsd/blob/node-http/lib/node/http.js
- https://github.com/handshake-org/hsd/pull/168

Previous Issues mentioning this include https://github.com/handshake-org/hsd/issues/12, https://github.com/handshake-org/hsd/issues/126