Added support for self-updating the .phar file.

Uses the herrera-io/phar-update package to update the application based on semantic version.

Author: tomzx

box.json

@@ -3,7 +3,7 @@
     "compactors": ["Herrera\\Box\\Compactor\\Php"],
     "compression": "GZ",
     "directories": ["src"],
-    "files": ["LICENSE"],
+    "files": ["LICENSE", "vendor/herrera-io/phar-update/res/schema.json"],
     "finder": [
         {
             "name": "*.php",

composer.json

@@ -27,13 +27,15 @@
 	],
 	"require": {
 		"php": ">=5.4.0",
-		"symfony/console": "2.7.*@dev",
+
+		"herrera-io/phar-update": "~2.0",
 		"nikic/php-parser": "dev-features/php-semver-checker",
+		"symfony/console": "2.7.*@dev",
 		"phpunit/php-file-iterator": "~1.3"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~4",
-		"mockery/mockery": "~0.9"
+		"mockery/mockery": "~0.9",
+		"phpunit/phpunit": "~4"
 	},
 	"autoload": {
 		"psr-4": {

src/PHPSemVerChecker/Console/Application.php

@@ -3,6 +3,7 @@
 namespace PHPSemVerChecker\Console;
 
 use PHPSemVerChecker\Console\Command\CompareCommand;
+use PHPSemVerChecker\Console\Command\SelfUpdateCommand;
 use Symfony\Component\Console\Application as SymfonyApplication;
 
 class Application extends SymfonyApplication {
@@ -30,6 +31,7 @@ protected function getDefaultCommands()
 	{
 		$commands = parent::getDefaultCommands();
 		$commands[] = $this->add(new CompareCommand());
+		$commands[] = $this->add(new SelfUpdateCommand());
 		return $commands;
 	}
 }

src/PHPSemVerChecker/Console/Command/SelfUpdateCommand.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace PHPSemVerChecker\Console\Command;
+
+use Herrera\Json\Exception\FileException;
+use Herrera\Phar\Update\Manager;
+use Herrera\Phar\Update\Manifest;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class SelfUpdateCommand extends Command {
+	const MANIFEST_FILE = 'https://tomzx.github.io/php-semver-checker/manifest.json';
+
+	protected function configure()
+	{
+		$this
+			->setName('self-update')
+			->setDescription('Update php-semver-checker.phar to the latest version')
+		;
+	}
+
+	protected function execute(InputInterface $input, OutputInterface $output)
+	{
+		$manager = new Manager(Manifest::loadFile(self::MANIFEST_FILE));
+		$manager->update($this->getApplication()->getVersion());
+	}
+}