style: enforcing JSHint

Added .jshintrc and fixed index.js to pass.

Test does not pass, because functions are being defined within a loop.
Along with assignment in place of condition there were many basic
syntax errors (lax commas, no space between keyword and parens, weak
equalities, etc).

There are even more issues with tests: repeated code, hardcoded paths.
I may just toss it and start again.

Author: hparra

.jshintrc

@@ -0,0 +1,23 @@
+{
+    "node": true,
+    "esnext": true,
+    "bitwise": true,
+    "camelcase": true,
+    "curly": true,
+    "eqeqeq": true,
+    "immed": true,
+    "indent": 4,
+    "latedef": true,
+    "newcap": true,
+    "noarg": true,
+    "quotmark": "double",
+    "regexp": true,
+    "undef": true,
+    "unused": true,
+    "strict": true,
+    "trailing": true,
+    "smarttabs": true,
+    "white": true,
+    "boss": true,
+    "laxcomma": false
+}

index.js

@@ -4,9 +4,10 @@ var cp = require("child_process"),
 	Stream = require("stream"),
 	gUtil = require("gulp-util");
 
-var PLUGIN_NAME = 'gulp-spawn';
+var PLUGIN_NAME = "gulp-spawn";
 
 function gulpSpawn(options) {
+	"use strict";
 
 	var stream = new Stream.PassThrough({objectMode: true});
 
@@ -16,9 +17,9 @@ function gulpSpawn(options) {
 			"command (\"cmd\") argument required");
 	}
 
-	stream._transform = function(file, unused, cb) {
+	stream._transform = function (file, unused, cb) {
 
-		if(file.isNull()) {
+		if (file.isNull()) {
 			stream.push(file);
 			return cb();
 		}
@@ -40,17 +41,17 @@ function gulpSpawn(options) {
 		var errBuffer = new Buffer(0);
 		program.stderr.on("readable", function () {
 			var chunk;
-			while(chunk = program.stderr.read()) {
+			while (chunk = program.stderr.read()) {
 				errBuffer = Buffer.concat([
 					errBuffer,
 					chunk
 				], errBuffer.length + chunk.length);
 			}
 		});
 		program.stderr.on("end", function () {
-			if(errBuffer.length) {
-				stream.emit('error', new gUtil.PluginError(PLUGIN_NAME,
-				errBuffer.toString('utf-8')));
+			if (errBuffer.length) {
+				stream.emit("error", new gUtil.PluginError(PLUGIN_NAME,
+				errBuffer.toString("utf-8")));
 			}
 		});
 
@@ -63,7 +64,7 @@ function gulpSpawn(options) {
 			// when program receives data add it to buffer
 			program.stdout.on("readable", function () {
 				var chunk;
-				while(chunk = program.stdout.read()) {
+				while (chunk = program.stdout.read()) {
 					newBuffer = Buffer.concat([
 						newBuffer,
 						chunk