Update the complete 'Initial Project Setup' paragraph

As proposed by WouterJ in #3827
this commit rewrites the 'Initial Project Setup' paragraph.

The documentation now describes the recommended way of creating a
new Symfony2 project, using Composer to download the Standard Distribution
+ vendors (instead of downloading the zipped version). As the Standard
Edition already contains a .gitignore, the example is replaced by a
link to the one stored at GitHub. The article also explains which files
are excluded by .gitignore.

The last step (downloading vendor libraries using Composer) is removed
as this is now covered by step 1.

Author: nicwortel

cookbook/workflow/new_project_git.rst

@@ -20,56 +20,55 @@ Initial Project Setup
 To get started, you'll need to download Symfony and initialize your local
 git repository:
 
-1. Download the `Symfony2 Standard Edition`_ without vendors.
+1. Download the `Symfony2 Standard Edition`_ using Composer:
 
-2. Unzip/untar the distribution. It will create a folder called Symfony with
-   your new project structure, config files, etc. Rename it to whatever you like.
+   .. code-block:: bash
+
+        $ php composer.phar create-project symfony/framework-standard-edition path/ 2.4.4
 
-3. Create a new file called ``.gitignore`` at the root of your new project
-   (e.g. next to the ``composer.json`` file) and paste the following into it. Files
-   matching these patterns will be ignored by Git:
+   Composer will now download the Standard Distribution along with all of the
+   required vendor libraries. For more information about downloading Symfony using
+   Composer, see `Installing Symfony using Composer`_.
 
-   .. code-block:: text
+2. Your project folder will now contain files of the Symfony framework, as well
+   as files and folders for vendor libraries. You'll want to store your project
+   files in Git, but not the dependencies, since they will be managed by Composer.
+   You'll also want to keep your ``parameters.yml`` out of your repository as it will
+   contain sensitive information, such as database credentials. Furthermore,
+   files that are automatically created by Symfony (such as logs, caches, and dumped
+   assets) should be excluded as well.
 
-        /web/bundles/
-        /app/bootstrap.php.cache
-        /app/cache/*
-        /app/config/parameters.yml
-        /app/logs/*
-        !app/cache/.gitkeep
-        !app/logs/.gitkeep
-        /build/
-        /vendor/
-        /bin/
-        /composer.phar
+   To help you keep these files out of your repository, Symfony comes with a file
+   called ``.gitignore``. It contains a list of files and folders that Git will
+   ignore.
+
+   The contents of the ``.gitignore`` file that comes with the Standard Distribution
+   can be found in the `GitHub repository`_.
 
 .. tip::
 
    You may also want to create a .gitignore file that can be used system-wide,
    in which case, you can find more information here: `Github .gitignore`_
    This way you can exclude files/folders often used by your IDE for all of your projects.
 
-4. Initialize your Git repository:
+3. Initialize your Git repository:
 
    .. code-block:: bash
 
         $ git init
 
-5. Add all of the initial files to Git:
+4. Add all of the initial files to Git:
 
    .. code-block:: bash
 
         $ git add .
 
-6. Create an initial commit with your started project:
+5. Create an initial commit with your started project:
 
    .. code-block:: bash
 
         $ git commit -m "Initial commit"
 
-7. Finally, download all of the third-party vendor libraries by
-   executing Composer. For details, see :ref:`installation-updating-vendors`.
-
 At this point, you have a fully-functional Symfony2 project that's correctly
 committed to Git. You can immediately begin development, committing the new
 changes to your Git repository.
@@ -116,6 +115,8 @@ manage this is `Gitolite`_.
 
 .. _`Git`: http://git-scm.com/
 .. _`Symfony2 Standard Edition`: http://symfony.com/download
+.. _`Installing Symfony using Composer`: http://symfony.com/doc/current/book/installation.html#option-1-composer
+.. _`GitHub repository`: https://github.com/symfony/symfony-standard/blob/master/.gitignore
 .. _`git submodules`: http://git-scm.com/book/en/Git-Tools-Submodules
 .. _`GitHub`: https://github.com/
 .. _`barebones repository`: http://git-scm.com/book/en/Git-Basics-Getting-a-Git-Repository