Adding two codelabs for cds2014.

native_client_sdk/src/doc/cds2014/python_summary.inc

+Learn how you can use client-side Python on your webpage.
+Use the python |difflib| module to generate attractive online
+textual diffs.
+Develop inside Google Chrome, using a hot off the presses version
+of our NaCl Dev Environment, running on a webpage,
+powered by Portable Native Client.
+The techniques in this codelab also apply to other interpreted languages
+we've ported to PNaCl, including: Python, Lua, Ruby, Tcl, Bash, and Forth.
+
+Requirements:
+  * A Desktop / Laptop Windows, Mac, Linux, or ChromeOS browser
+    |python_check|
+  * A fast broadband connection (500MB download)
+  * Can read and write Python
+
+
+.. |difflib| raw:: html
+
+  <a href="https://docs.python.org/2/library/difflib.html"
+   target="_blank">difflib</a>
+
+
+.. |python_check| raw:: html
+
+  <br/><span id="python_compat" style="color: #cccc00"
+      >Checking browser compatibility...</span><br/>
+  <i id="python_compat2"></i>
+  <script>
+  var tag = document.getElementById('python_compat');
+  var tag2 = document.getElementById('python_compat2');
+  if (!('application/x-pnacl' in navigator.mimeTypes)) {
+    tag.innerHTML =
+        'This codelab does not appear to be supported by your browser.';
+    tag.style.color = '#cc0000';
+    tag2.innerHTML =
+        'You do not appear to be running a browser such as ' +
+        'Google Chrome which supports Portable Native Client ' +
+        'or you have disabled Portable Native Client.';
+  } else {
+    tag.innerHTML = 'This codelab appears to be supported by your browser.';
+    tag.style.color = '#00cc00';
+  }
+  </script>