old_contents: var MONGODB_URL = process.env.MONGODB_URL || null;
  
  if (MONGODB_URL) {
    module.exports = {
      db: {
        name: 'db',
        connector: 'loopback-connector-mongodb',
        url: MONGODB_URL
      }
    };
  }
  
new_contents: var MONGODB_URL = process.env.MONGODB_URL || null;
  
  if (MONGODB_URL) {
    module.exports = {
      db: {
        name: 'db',
        connector: 'loopback-connector-mongodb',
        url: MONGODB_URL
      }
    };
  }
  
  var STORAGE_PROVIDER = process.env.STORAGE_PROVIDER || 'filesystem';
  
  if(STORAGE_PROVIDER === 'filesystem') {
  
    var STORAGE_PATH = process.env.STORAGE_PATH || './storage';
  
    module.exports = {
      storage: {
        name: 'storage',
        connector: 'loopback-component-storage',
        provider: STORAGE_PROVIDER ,
        root: STORAGE_PATH
      }
    };
  }
  
  if(STORAGE_PROVIDER === 'amazon') {
  
    var S3_KEY = process.env.S3_KEY || null;
    var S3_KEY_ID = process.env.S3_KEY_ID || null;
  
    module.exports = {
      storage: {
        name: 'storage',
        connector: 'loopback-component-storage',
        provider: STORAGE_PROVIDER,
        key: S3_KEY,
        keyId: S3_KEY_ID
      }
    };
  }
  
subject: Add configration for storage providers