Removed logger & Added mapSchema function

[Didas-git]

In my opinion it wasnt a proper logger, also console.info and console.debug are alias to console.log they dont do anything else

[Didas-git]

de8a580 addresses #25
and helps ts devs with a faster way to handle the types for their Entities. This is a temporary way of doing it but i decided to commit it because to make it a feature of the lib would break backwards compatibility.
Usage:

import { Entity, mapSchema, Schema, SchemaDefinition } from "redis-om";

type AlbumSchema = typeof albumSchemaDef;
interface Album extends AlbumSchema { };
class Album extends Entity { };

const albumSchemaDef = mapSchema({
    artist: { type: 'string' },
    title: { type: 'text' },
    year: { type: 'number' },
    genres: { type: 'array' },
    outOfPublication: { type: 'boolean' }
})

const albumSchema = new Schema(Album, <SchemaDefinition><unknown>albumSchemaDef)