i2cdetect

changes:

• include last id in scan
  
• change if clause
  

• add I2C1.setup() sample for Espruino boards

  function isDeviceOnBus(i2c,id) {
    try {
      return i2c.readFrom(id,1);
    }
    catch(err) {
      return -1;
    }
  }
  
  function detect(i2c,first, last) {
    first = first | 0;
    last = last | 0x77;
    var idsOnBus = Array();
    for (var id = first; id <= last; id++) {
      if ( isDeviceOnBus(i2c,id) != -1) {
        idsOnBus.push(id);
      }
    }
    return idsOnBus;
  }
  
  // Espruino boards
  // I2C1.setup( {scl: B8, sda: B9} );
  
  // ESP8266 
  I2C1.setup({sda: D2, scl: D4} );
  
  console.log('I2C detect as array:',detect(I2C1));