snpEff 4.1
snpEff 4.1

This follows @heuermh upgrade to 4.0 to the latest 4.1 release from
last week. The 3.6 to 4.0 transition is pretty tricky as their are
database incompatibilities and the snpEff databases are not versioned
as of 4.0. 4.1 introduces versioning so is an easier upgrade path from
3.6 and should make things generally easier going forward.

Closes #1683.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

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