Add bump major, minor, and patch version scripts for semantic versioning

scripts/bump_patch_version.php

@@ -0,0 +1,25 @@
+#!/usr/bin/php
+<?php
+require dirname(__FILE__) . '/../src/Curl/Curl.php';
+
+$current_version = Curl\Curl::VERSION;
+list($major, $minor, $patch) = explode('.', $current_version);
+$new_version = implode('.', array($major, $minor, (string)((int)$patch += 1)));
+
+foreach(
+    array(
+        array(
+            dirname(__FILE__) . '/../composer.json',
+            '/"version": "(?:\d+.\d+.\d+)"/',
+            '"version": "' . $new_version . '"',
+        ),
+        array(
+            dirname(__FILE__) . '/../src/Curl/Curl.php',
+            '/const VERSION = \'(?:\d+.\d+.\d+)\';/',
+            'const VERSION = \'' . $new_version . '\';',
+        ),
+    ) as $info) {
+    list($filepath, $find, $replace)  = $info;
+    $data = preg_replace($find, $replace, file_get_contents($filepath));
+    file_put_contents($filepath, $data);
+}