Adding images

Resolves #24

All media files in the _media directory will get copied to the _site/media directory upon build. To reference an image in your Markdown, use the following syntax
To reference an image in your Markdown, use the following syntax

![Image Alt](../media/image.png "Image Title") # Note the relative path

Since most images are probably going to be in blog posts or documentation pages you need to prepend the ../ before the "media". However, if you are referencing the image in a Markdown page you should use media/image.png for the path.

Nested media directories are not yet supported.