lumpy-sv 0.1.4: new formula for Lumpy structural variation caller

Adds build info for Lumpy 0.1.4, downloadable through a specific Git
hash. This structural variation caller supports integration of multiple
structural variant detection approaches, including split and paired end reads.

This is part of a few structural variant calling tools to merge into homebrew-science. Happy for feedback or tips on any of the recipes. I'm still learning brew but looking forward to contributing to the community.