message: Add optional epoch to IConnect message
diff: @@ -46,6 +46,12 @@ export interface IConnect {
  * An optional nonce used during connection to identify connection attempts
  */
  nonce?: string;
  +
  + /**
  + * Represents the version of document at client. It should match the version on server
  + * for connection to be successful.
  + */
  + epoch?: string;
  }
  /**
  