Adding two codelabs for cds2014.

native_client_sdk/src/doc/nacldev/editing.inc

Index: native_client_sdk/src/doc/nacldev/editing.inc
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+Editing
+```````
+
+To follow along in this codelab, you'll need to use a text editor to modify
+various files in our development environment.
+There are currently two editor options, nano or vim.
+We have an Emacs port, but it is not yet available in the Dev Environment
+(coming soon).
+If you're unsure what to pick, nano is simpler to start with and has on-screen
+help.
+
+* You can open **nano** like this::
+
+    $ nano <filename>
+
+  Here's an online `nano tutorial <http://mintaka.sdsu.edu/reu/nano.html>`_.
+
+* You can open **vim** like this::
+
+    $ vim <filename>
+
+  Here's an online `vim tutorial <http://www.openvim.com/tutorial.html>`_.