cleanup

fix two typos
remove extraneous whitespace
correct min and max value setting
   - now behaves as expected when there are zeros in data
expand graph title formatting
   - box now accommodates title when title is wider than graph
print xlabels in full
   - no longer truncated when longer than longest y value

![cmd_1](https://cloud.githubusercontent.com/assets/529129/2543861/0fa10890-b5f8-11e3-88dc-4a93f4e2c88c.png)
![before_1](https://cloud.githubusercontent.com/assets/529129/2543848/f5ef78fa-b5f7-11e3-81cf-5bfb4a3a66a8.png)
![after_1](https://cloud.githubusercontent.com/assets/529129/2543849/f5f1ae90-b5f7-11e3-8c21-d8447dfc80cb.png)