Add typings for Typescript

[flesler]

I wrote my version of the typings. I will be deleting them so I'll paste them here in case we ever want to polish and add them.

declare module 'resin-device-logs' {

	import { EventEmitter } from 'events'

	type PubNubKeys = {
		publishKey?: string
		subscribeKey?: string
	}

	type Device = {
		logs_channel?: string
		uuid?: string
	}

	interface Emitter extends EventEmitter {
		unsubscribe() : void
	}

	type Message = {
		message: string
		timestamp?: number
		isSystem: boolean,
		serviceId?: string
	}

	type Options = {
		channel: string
		reverse?: boolean // default false
		count?: number // default 100
	}

	export function subscribe(pubnubKeys: PubNubKeys, device: Device): EventEmitter
	export function history(pubnubKeys: PubNubKeys, device: Device, options?: Options): Promise<Message[]>
	export function historySinceLastClear(pubnubKeys: PubNubKeys, device: Device, options?: Options): Promise<Message[]>
	export function clear(pubnubKeys: PubNubKeys, device: Device): Promise<any>
	export function getLastClearTime(pubnubKeys: PubNubKeys, device: Device): Promise<number>
}

[pimterry]

We are going to want to convert this all to typescript soonish, so this will definitely be useful, thanks!