Our paper, Psi4 1.1: An Open-Source Electronic Structure Program Emphasizing Automation, Advanced Libraries, and Interoperability, is available under the Just Accepted Manuscripts section of the Journal of Chemical Theory and Computation, at http://pubs.acs.org/doi/abs/10.1021/acs.jctc.7b00174
We expect to have the associated 1.1 release of the software finalized very soon.