remove unused async dependency

lib/reader.js

@@ -4,8 +4,7 @@ var util = require('util'),
     url = require('url'),
     assert = require('assert');
 
-var async = require('async'),
-    http = require('http-get'),
+var http = require('http-get'),
     debug = require('debug')('hls:reader');
 
 try {

lib/tsblast.js

@@ -2,8 +2,6 @@ var dgram = require('dgram'),
     util = require('util'),
     assert = require('assert');
 
-var async = require('async');
-
 try {
   var Writable = require('stream').Writable;
   assert(Writable);

lib/tssmooth.js

@@ -2,8 +2,6 @@ var util = require('util'),
     assert = require('assert'),
     debug = require('debug')('hls:tssmooth');
 
-var async = require('async');
-
 try {
   var Transform = require('stream').Transform;
   assert(Transform);

package.json

@@ -28,7 +28,6 @@
     "debug": "~0.7.0",
     "carrier": "~0.1.8",
     "commander": "~1.1.1",
-    "async": "~0.1.22",
     "readable-stream": "~0.3.0",
     "http-get": "git+https://github.com/kanongil/http-get.git#stream-error-fix"
   },