message: remove array-buffer-concat dep
diff: -import bufferConcat = require('array-buffer-concat');
  import Base64ArrayBuffer = require('base64-arraybuffer')
  import ByteBuffer = require('bytebuffer')
  @@ -6,7 +5,7 @@ let decoder = new (<any>window).TextDecoder('utf-8');
  let encoder = new (<any>window).TextEncoder('utf-8');
  let ArrayBufferUtils = {
  - concat: (a: ArrayBuffer, b: ArrayBuffer) => bufferConcat(a, b),
  + concat: (a: ArrayBuffer, b: ArrayBuffer) => ByteBuffer.concat([a, b]),
  decode: (a: ArrayBuffer): string => decoder.decode(a),
  