NuGet package dll's + content files = fail?

I created a nuget package. I put some files and folders in a "content" folder and it worked great. So I added a bin folder with dll's and put this in my nuspec file :

  <files>
     src="bin\*.dll" target="lib" />
  </files>

dll's are nicely put in the reference, but the content isn't copied anymore.

How can I manage to get them both working ?

@Edit

I know have this:

<file src="content\Controllers\*.*" target="Controllers" />
<file src="content\Views\Account\*.*" target = "Views\Account" />
<file src="bin\*.dll" target="lib" />

The package contains the right structure and files, but the files are not copied into my project.

The files are in a folder structure. When I put them directly into my content folder the are copied to the root of my project ...