Do not ignore composer.lock

https://github.com/yiisoft/yii2/commit/a6c251d2ab6d222b5318cc7fa21eb3791a296c62#commitcomment-3291785

.gitignore

@@ -1 +0,0 @@
-composer.lock

composer.lock

@@ -0,0 +1,164 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
+    ],
+    "hash": "0411dbbd774aa1c89256c77c68023940",
+    "packages": [
+        {
+            "name": "yiisoft/yii2",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/yiisoft/yii2-framework.git",
+                "reference": "15a8d0559260e39954a8eb6de0d28bfb7de95e7b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/yiisoft/yii2-framework/zipball/15a8d0559260e39954a8eb6de0d28bfb7de95e7b",
+                "reference": "15a8d0559260e39954a8eb6de0d28bfb7de95e7b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-mbstring": "*",
+                "lib-pcre": "*",
+                "php": ">=5.3.7"
+            },
+            "suggest": {
+                "ezyang/htmlpurifier": "Required by HtmlPurifier.",
+                "michelf/php-markdown": "Required by Markdown.",
+                "smarty/smarty": "Required by SmartyViewRenderer.",
+                "twig/twig": "Required by TwigViewRenderer."
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "yii\\": "/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Qiang Xue",
+                    "email": "qiang.xue@gmail.com",
+                    "homepage": "http://www.yiiframework.com/",
+                    "role": "Founder and project lead"
+                },
+                {
+                    "name": "Alexander Makarov",
+                    "email": "sam@rmcreative.ru",
+                    "homepage": "http://rmcreative.ru/",
+                    "role": "Core framework development"
+                },
+                {
+                    "name": "Maurizio Domba",
+                    "homepage": "http://mdomba.info/",
+                    "role": "Core framework development"
+                },
+                {
+                    "name": "Carsten Brandt",
+                    "email": "mail@cebe.cc",
+                    "homepage": "http://cebe.cc/",
+                    "role": "Core framework development"
+                },
+                {
+                    "name": "Wei Zhuo",
+                    "email": "weizhuo@gmail.com",
+                    "role": "Project site maintenance and development"
+                },
+                {
+                    "name": "Sebastián Thierer",
+                    "email": "sebas@artfos.com",
+                    "role": "Component development"
+                },
+                {
+                    "name": "Jeffrey Winesett",
+                    "email": "jefftulsa@gmail.com",
+                    "role": "Documentation and marketing"
+                },
+                {
+                    "name": "Timur Ruziev",
+                    "email": "resurtm@gmail.com",
+                    "homepage": "http://resurtm.com/",
+                    "role": "Core framework development"
+                },
+                {
+                    "name": "Paul Klimov",
+                    "email": "klimov.paul@gmail.com",
+                    "role": "Core framework development"
+                }
+            ],
+            "description": "Yii2 Web Programming Framework",
+            "homepage": "http://www.yiiframework.com/",
+            "keywords": [
+                "framework",
+                "yii"
+            ],
+            "time": "2013-05-25 20:59:05"
+        },
+        {
+            "name": "yiisoft/yii2-composer",
+            "version": "dev-master",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/yiisoft/yii2-composer.git",
+                "reference": "7ce4060faca940b836ab88de207638940a0a0568"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/yiisoft/yii2-composer/zipball/7ce4060faca940b836ab88de207638940a0a0568",
+                "reference": "7ce4060faca940b836ab88de207638940a0a0568",
+                "shasum": ""
+            },
+            "require": {
+                "yiisoft/yii2": "*"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "yii\\composer": ""
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Qiang Xue",
+                    "email": "qiang.xue@gmail.com",
+                    "homepage": "http://www.yiiframework.com/",
+                    "role": "Founder and project lead"
+                }
+            ],
+            "description": "The composer integration for the Yii framework",
+            "keywords": [
+                "composer",
+                "install",
+                "update",
+                "yii"
+            ],
+            "time": "2013-05-23 19:12:45"
+        }
+    ],
+    "packages-dev": [
+
+    ],
+    "aliases": [
+
+    ],
+    "minimum-stability": "dev",
+    "stability-flags": {
+        "yiisoft/yii2": 20,
+        "yiisoft/yii2-composer": 20
+    },
+    "platform": {
+        "php": ">=5.3.0"
+    },
+    "platform-dev": [
+
+    ]
+}