Bump version from 0.1.47 to 0.1.48.
Bump version from 0.1.47 to 0.1.48.

Minor update because 0.1.47 failed to actually fix jenkins. Bad night.
Also revisited the HACKING file, aligning it more closely with Bayeslite's.

probcomp/crosscat,probcomp/crosscat,probcomp/crosscat,mit-probabilistic-computing-project/crosscat,probcomp/crosscat,mit-probabilistic-computing-project/crosscat,probcomp/crosscat,probcomp/crosscat,mit-probabilistic-computing-project/crosscat,mit-probabilistic-computing-project/crosscat,probcomp/crosscat,mit-probabilistic-computing-project/crosscat,mit-probabilistic-computing-project/crosscat,probcomp/crosscat,mit-probabilistic-computing-project/crosscat