Simplify the install even more

[rmcolq]

This PR does the following:

1. I found a way to avoid having the user type git lfs commands and having to unzip the files during install. This makes the install much more user friendly.
2. Unfortunately the above (and the previous version of virbot) were not possible to directly convert to a bioconda recipe. To make this possible the directory of references has to be a command line parameter. This then allows for error handling when that directory can't be found where expected and a work around for providing the file directly. I now have a bioconda recipe that I've tested on my fork. If you merge this in I'll submit the recipe to bioconda.
3. I've also moved the seq files so they are available but zipped them to save space and mentioned they exist in the README.