cleanup

fix two typos
remove extraneous whitespace
correct min and max value setting
   - now behaves as expected when there are multiple 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](https://cloud.githubusercontent.com/assets/529129/2544023/1f920f22-b5fa-11e3-836b-76536c3632e3.png)
![before](https://cloud.githubusercontent.com/assets/529129/2544024/1fa3c74e-b5fa-11e3-842d-3192f0d2970b.png)
![after](https://cloud.githubusercontent.com/assets/529129/2544025/1faf3124-b5fa-11e3-9997-39f1e21f410c.png)