[IMP-users] IMP 2.1 release

IMP 2.1 has been released. You can either get the source from the master branch (https://github.com/salilab/imp/tree/master) or binary installers from the downloads tab (http://integrativemodeling.org/download.html). See the release notes (https://github.com/salilab/imp/releases/tag/2.1.0) for a list of changes.