beadChips async init function

async-init-beadChip.js

beadChip.prototype.init = function(file) {

  // Localize beadChip members
  var build    = this.buildBeadChip; 
  var rows     = this.rows;
  var sections = this.sections;
  var pass     = this.pass;
  var fail     = this.fail;

  var metricStream = fs.createReadStream(file, {
    flags: 'r',
    encoding: 'utf8',
    mode: 0666
  });

  // Open file and stream data out
  var allData = ""; 
  metricStream.on('open', function(fd) {

    metricStream.on('data', function(data) {
      allData += data;
    });

    metricStream.on('error', function(err) { 
      console.log(err);
    });

    // When EOF, split string on newline
    metricStream.on('end', function() { 

      var eachRow = function(row, callback) {
        rows.push(row);
        callback();
      };

      async.forEach(allData.split('\n'), eachRow, function(err) {
        if(err) console.log(err);

        build(rows, sections, pass, fail); 
      });
    });
  });
};