Replace cross-spawn-async with cross-spawn (#1563)

Both packages have been merged and cross-spawn is now
doing the same as cross-spawn-async before

package.json

@@ -54,7 +54,7 @@
   "dependencies": {
     "async-foreach": "^0.1.3",
     "chalk": "^1.1.1",
-    "cross-spawn-async": "^2.1.9",
+    "cross-spawn": "^3.0.0",
     "gaze": "^1.0.0",
     "get-stdin": "^4.0.1",
     "glob": "^7.0.3",

scripts/build.js

@@ -7,7 +7,7 @@ var eol = require('os').EOL,
     fs = require('fs'),
     mkdir = require('mkdirp'),
     path = require('path'),
-    spawn = require('cross-spawn-async'),
+    spawn = require('cross-spawn'),
     sass = require('../lib/extensions');
 
 /**

test/cli.js

@@ -5,7 +5,7 @@ var assert = require('assert'),
     glob = require('glob'),
     rimraf = require('rimraf'),
     stream = require('stream'),
-    spawn = require('cross-spawn-async'),
+    spawn = require('cross-spawn'),
     cli = path.join(__dirname, '..', 'bin', 'node-sass'),
     fixture = path.join.bind(null, __dirname, 'fixtures'),
     LIBSASS_VERSION = null;