Add unix (sh -c) and win32 (cmd /c) to command head

lib/exec.js

@@ -4,21 +4,21 @@ var objectAssign = require('object-assign');
 
 module.exports = function exec(script) {
 
-	// Grab the command section of the entered command
-	var command = script.command.split(' ')[0];
-	// Anything else is options
-	var options = script.command.split(' ').slice(1);
-
 	var argv = process.argv.splice(3);
-
-	options = options.concat(argv);
+	var command = script.command + ' ' + argv.join(' ');
 
 	script.env = script.env || {};
 
 	var env = objectAssign(process.env, script.env, dotenv);
 
-	console.log('to be executed:', command, options.join(' '));
-	spawn(command, options, {
+	var sh = 'sh', shFlag = '-c';
+	if (process.platform === 'win32') {
+		sh = 'cmd';
+		shFlag = '/c';
+	}
+
+	console.log('to be executed:', command);
+	spawn(sh, [shFlag, command], {
 		env: env,
 		stdio: ['pipe', process.stdout, process.stderr]
 	}).on('close', function(code) {