Plot enhancements

I've added the functionality to specify the following options for our CMC plots:
* Title
* Y axis limits
* Line thickness
* Legend position
* Text size

An example:
```br -plot Algorithm_medsdataset/* pdf/MEDS.pdf[minimalist, cmcOptions="[title=Retrieval Rates of OpenBR on MEDS,legendPosition=(.5,.15),yLimits=(0,.8),thickness=3,textSize=16]"]```

I'd also like to provide options for ROC plots as well, and am happy to add any that people request (or more for CMC plots).