Latest Espruino build for Esp8266

New build, again teetering on the bleeding edge...
http://s3.voneicken.com/espruino/espruino_1v84.tve_master_91e353d_esp8266.tgz

Fixes:

• any exception causes esp8266 to freeze and then restart
  
• server socket end() method does not work
  
  

@Gordon you may want to cherry-pick https://github.com/tve/Espruino/commit/91e353d41f3d260716a39d27349dfc0c39fe06be 'cause it affects all platforms. I was waiting to change some of the telnet console memory allocation stuff before creating a pull request. If you'd rather have one now I'm happy to do that too.