Epitope Prediction : New Module Added

New module to filter based on binding affinities and merge results from different allele-length combinates.
Based on the changes you've made, +1.

When I submit changes for code review, I usually wait to get two "+1"s before merging my changes.  If two people haven't offered feedback after 24 hours (or if opinions are divided), the [Code Review Guidelines](https://github.com/genome/docs/wiki/Code-Review-Guidelines) say the author can merge at their discretion.

I hope that another pull request for an accompanying test is forthcoming!