Package added: Jetty

@Nilzor, it is recommendable to always include the icon into the repository. Look how it is done with other packages: https://github.com/ferventcoder/chocolatey-packages/blob/master/automatic/googledrive/googledrive.nuspec#L12

 It is not a good idea to hotlik icons from external resources where the package maintainer has no control over it. If you ask me the way how NuGet handles package icons is extremely unwise.

@ferventcoder maybe a note in the README.md how icons should be handled would be a good idea, for example like this: https://github.com/TomOne/chocolatey-packages/blob/master/README.md#notes-on-the-icons