This upgrades snappy-java to 1.1.1.5, which improves error messages when attempting to deserialize empty inputs using SnappyInputStream (see https://github.com/xerial/snappy-java/issues/89).

Author: Josh Rosen <rosenville@gmail.com>
Author: Josh Rosen <joshrosen@databricks.com>

Closes #2911 from JoshRosen/upgrade-snappy-java and squashes the following commits:

adec96c [Josh Rosen] Use snappy-java 1.1.1.5
cc953d6 [Josh Rosen] [SPARK-4056] Upgrade snappy-java to 1.1.1.4