esp8266 build unification

@tve, your version made a test on 4MB version.

• Upload happened with ESP8266 Flasher and worked fine.
  
• Testing my http-Server worked fine.
  

• testing flash:

  var f = require("Flash"),s = 0x68000;
  for(var i = s;i < 0x80000;i+=4096){
  console.log(i.toString(16),f.read(8,i));­
  }
  for(i = 0x80000; i < 0x100000; i += 0x4000){
  console.log(i.toString(16),f.read(8,i));­
  }
  

worked. Some results are strange in my eyes:

• reading from 0x7E000 and 0x7F000 returns an empty array. This usually happens for areas, that can't be read using flash
  
• same for 0x80000 and 0x84000
  
• at 0x88000 is some data, is this some old data, or something totally different
  Everything else looks fine to me.
  Testing with wiflash will follow later, its time for bed now.