Latest Espruino build for Esp8266

New build: http://s3.voneicken.com/espruino/espruino_1v84.tve_master_d8dec28_esp8266.tgz

Changes:

• Fixes crash when trying to call nonexistent function (such as Wifi.getIPAddr()).
  
• Fixes parameter order in Wifi.setSNTP call.
  
• Tweaks buffers to get back to 1400 JSvars
  
  

Links:

• The Wifi library is documented at http://www.espruino.com/Reference#Wifi
  
• The ESP8266 library is documented at http://s3.voneicken.com/espruino/functions.html#ESP8266
  
• General esp8266 port documentation is at http://www.espruino.com/EspruinoESP8266
  
• Sources are at https://github.com/tve/Espruino
  
• Flashing the esp8266 tutorial is at https://github.com/tve/EspruinoDocs/blob/master/tutorials/ESP8266_Flashing.md