Nextion GPS Speedometer

This is a multifunction GPS-based speedometer

**Hardware Required**
* WeMos D1 Mini microcontroller
* GPS module
* Nextion NX2432T024 HMI display
* DHT22 temperature/humidity sensor
* Optional 128x64 IIC oled display
* Jumper wires

**Displays on a Nextion display the following Data**
* Speed
* Heading
* Current time
* Date
* Temperature
* Humidity
* Heat index

**Library Dependencies:**
* Nextion by ITEAD Studio
* ESP8266_SSD1306 by Fabrice Weinberg & Daniel Eichhorn
* Adafruit Unified Sensor by Adafruit
* DHT sensor library by Adafruit
* TinyGPSPlus by Mikal Hart

**Required changes for Nextion:**
* NexConfig.h:
Comment out DEBUG_SERIAL_ENABLE, we're not using Nextion debug
Only Serial1 TX pin is connected, we can't recieve anything from Nextion
ESP8266 Serial1 RX is not available, it is used used internally by WeMos
* NexHardware.h:
change timeout values to zero otherwise display wi