code: public String offset(){
  		if(this.forecast.get("offset").asDouble()<0)
  			return ""+this.forecast.get("offset").asDouble();
  		else if(this.forecast.get("offset").asDouble()>0)
  			return ""+"+"+this.forecast.get("offset").asDouble();
  		else
  			return "";
  	}
docs: Returns the offset as a String with '+' or '-' sign.
  For more information refer to the API Docs:
  <a href="https://developer.forecast.io">https://developer.forecast.io</a>
  @return String with the offset