max values and y-val of 0

include max data values (previously were left out of plot)
include max y values (previously were left off of y axis)
show y scale such that height of column in histogram corresponds to
  correct y value (previously corresponded to y-1)
no need to include 0 in ys. Rather, start ys at min of 1, and
  leave cols with y val of 0 empty.

![cmd](https://cloud.githubusercontent.com/assets/529129/2574582/819d81a8-b936-11e3-81cd-5e4cbbeb24b2.png)
![bball_hist](https://cloud.githubusercontent.com/assets/529129/2574668/07b41f94-b938-11e3-8503-9d4f7931c361.png)
![before](https://cloud.githubusercontent.com/assets/529129/2574584/8a52da28-b936-11e3-8a80-c8ad5bc07bfe.png)
![after](https://cloud.githubusercontent.com/assets/529129/2574583/85fc2830-b936-11e3-8814-e4e3aec36e0f.png)