MQTT on ESP8266 with Espruino

Tested new version(1v81.705) immediately :-)
For websocket SHA1 is needed, this was my choice to compare benefit:

• old SHA1 duration was 1390ms and process.memory().free after calling was 735
  
• after a lot of changes it's 1047ms and 823 blocks are free
  
• now with new firmware version it takes 1290ms and 866 blocks are free
  So for this function it uses less memory (20%) and is slower (20%), interesting result.