Merge branch 'develop' of git://github.com/EllisLab/CodeIgniter into develop

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+###############
+Download Helper
+###############
+
+The Download Helper lets you download data to your desktop.
+
+.. contents:: Page Contents
+
+Loading this Helper
+===================
+
+This helper is loaded using the following code
+
+::
+
+	$this->load->helper('download');
+
+The following functions are available:
+
+force_download('filename', 'data')
+==================================
+
+Generates server headers which force data to be downloaded to your
+desktop. Useful with file downloads. The first parameter is the **name
+you want the downloaded file to be named**, the second parameter is the
+file data. Example
+
+::
+
+	$data = 'Here is some text!';
+	$name = 'mytext.txt';
+	force_download($name, $data);
+
+If you want to download an existing file from your server you'll need to
+read the file into a string
+
+::
+
+	$data = file_get_contents("/path/to/photo.jpg"); // Read the file's contents
+	$name = 'myphoto.jpg';
+	force_download($name, $data);
+