D. Sijacki, M. Vogelsberger, D. Keres, V. Springel, and L. Hernquist. (2011)cite arxiv:1109.3468Comment: 29 pages, 27 figures, MNRAS submitted. Movies and high-resolution images can be found at http://www.cfa.harvard.edu/itc/research/movingmeshcosmology/.