website: document compress post-processor

website/source/docs/post-processors/compress.html.markdown

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+---
+layout: "docs"
+page_title: "compress Post-Processor"
+---
+
+# Compress Post-Processor
+
+Type: `compress`
+
+The compress post-processor takes an artifact with files (such as from
+VMware or VirtualBox) and gzip compresses the artifact into a single
+archive.
+
+## Configuration
+
+The configuration for this post-processor is extremely simple.
+
+* `output` (string) - The path to save the compressed archive.
+
+## Example
+
+An example is shown below, showing only the post-processor configuration:
+
+<pre class="prettyprint">
+{
+  "type": "compress",
+  "path": "foo.tar.gz"
+}
+</pre>