Having example images in 'lib/assets' makes it appear as those are

"Rails like" assets for use in Sprockets.  Specifically Middleman app
looks for this directory and includes it in the build output.

As these images aren't assets, but simply used in the README they should
be moved into an alternate directory to avoid confusion.

See here for what Middleman (and I would assume other sprocket aware
gems) look for:

https://github.com/middleman/middleman-sprockets/blob/master/lib/middleman-sprockets/extension.rb#L119

README.md

@@ -1,4 +1,4 @@
-![SSHKit Logo](https://raw.github.com/leehambley/sshkit/master/assets/images/logo.png)
+![SSHKit Logo](https://raw.github.com/leehambley/sshkit/master/examples/images/logo.png)
 
 **SSHKit** is a toolkit for running commands in a structured way on one or
 more servers.
@@ -199,7 +199,7 @@ first argument before attempting to find it in the *command map*.
 
 ## Output Handling
 
-![Example Output](https://raw.github.com/leehambley/sshkit/master/assets/images/example_output.png)
+![Example Output](https://raw.github.com/leehambley/sshkit/master/examples/images/example_output.png)
 
 By default, the output format is set to `:pretty`: