Now with tails!

New maxRowHeightPolicy 'tail' allows for an unfinished final row if the items you provide cannot be fitted perfectly in the mosaic. The items on the final row still keep their aspect ratio, and respect the specificed maxRowHeight. This leaves an empty space at the end, but that might be what you want! This new policy also takes care of the problem of single-row mosaics: They will be shown even if the provided mosaic items are not enough to fill the row. Enjoy!