Adding type definitions for pg

This is heavily based on the definitions from sqlite3. The Connection
class is not defined because pg says that it is private for most use
cases. I left that work for people who need it.

pg/pg.d.ts

@@ -0,0 +1,88 @@
+// Type definitions for pg
+// Project: https://github.com/brianc/node-postgres
+// Definitions by: Phips Peter <http://pspeter3.com>
+// Definitions: https://github.com/borisyankov/DefinitelyTyped
+
+/// <reference path="../node/node.d.ts" />
+
+declare module "pg" {
+    import events = require("events");
+    import stream = require("stream");
+
+    export function connect(connection: string, callback: (err: Error, client: Client, done: () => void) => void): void;
+    export function connect(config: ClientConfig, callback: (err: Error, client: Client, done: () => void) => void): void;
+    export function end(): void;
+
+    export interface ConnectionConfig {
+        user?: string;
+        database?: string;
+        password?: string;
+        port?: number;
+        host?: string;
+    }
+
+    export interface Defaults extends ConnectionConfig {
+        poolSize?: number;
+        poolIdleTimeout?: number;
+        reapIntervalMillis?: number;
+        binary?: boolean;
+        parseInt8?: boolean;
+    }
+
+    export interface ClientConfig extends ConnectionConfig {
+        ssl?: boolean;
+    }
+
+    export interface QueryConfig {
+        name?: string;
+        text: string;
+        values?: any[];
+    }
+
+    export interface QueryResult {
+        rows: any[];
+    }
+
+    export interface ResultBuilder extends QueryResult {
+        command: string;
+        rowCount: number;
+        oid: number;
+        addRow(row: any): void;
+    }
+
+    export class Client extends events.EventEmitter {
+        constructor(connection: string);
+        constructor(config: ClientConfig);
+
+        connect(callback?: (err:Error) => void): void;
+        end(): void;
+
+        query(queryText: string, callback?: (err: Error, result: QueryResult) => void): Query;
+        query(config: QueryConfig, callback?: (err: Error, result: QueryResult) => void): Query;
+        query(queryText: string, values: any[], callback?: (err: Error, result: QueryResult) => void): Query;
+
+        copyFrom(queryText: string): stream.Writable;
+        copyTo(queryText: string): stream.Readable;
+
+        pauseDrain(): void;
+        resumeDrain(): void;
+
+        public on(event: "drain", listener: () => void): Client;
+        public on(event: "error", listener: (err: Error) => void): Client;
+        public on(event: "notification", listener: (message: any) => void): Client;
+        public on(event: "notice", listener: (message: any) => void): Client;
+        public on(event: string, listener: Function): Client;
+    }
+
+    export class Query extends events.EventEmitter {
+        public on(event: "row", listener: (row: any, result?: ResultBuilder) => void): Query;
+        public on(event: "error", listener: (err: Error) => void): Query;
+        public on(event: "end", listener: (result: ResultBuilder) => void): Query;
+        public on(event: string, listener: Function): Query;
+    }
+
+    export class Events extends events.EventEmitter {
+        public on(event: "error", listener: (err: Error, client: Client) => void): Events;
+        public on(event: string, listener: Function): Events;
+    }
+}