Add file provisioner documentation.

website/source/docs/provisioners/file.html.markdown

+---
+layout: "docs"
+---
+
+# File Provisioner
+
+Type: `file`
+
+The file provisioner uploads files to machines build by Packer.
+
+## Basic Example
+
+<pre class="prettyprint">
+{
+  "type": "file",
+  "source": "app.tar.gz",
+  "destination": "/tmp/app.tar.gz"
+}
+</pre>
+
+## Configuration Reference
+
+The available configuration options are listed below. All elements are required.
+
+* `source` (string) - The path to a local file to upload to the machine. The
+  path can be absolute or relative. If it is relative, it is relative to the 
+  working directory when ?Packer is executed.
+
+* `destination` (string) - The path where the file will be uploaded to in the 
+  machine. This value must be a writable location and any parent directories 
+  must already exist.

website/source/docs/provisioners/shell.html.markdown

@@ -23,7 +23,7 @@ The example below is fully functional.
 
 ## Configuration Reference
 
-The reference of available configuratin options is listed below. The only
+The reference of available configuration options is listed below. The only
 required element is either "inline" or "script". Every other option is optional.
 
 Exactly _one_ of the following is required:

website/source/layouts/docs.erb

@@ -36,6 +36,7 @@
 		<ul>
 			<li><h4>Provisioners</h4></li>
 			<li><a href="/docs/provisioners/shell.html">Shell Scripts</a></li>
+			<li><a href="/docs/provisioners/file.html">File Uploads</a></li>
 			<li><a href="/docs/provisioners/custom.html">Custom</a></li>
 		</ul>