Bumped Guava version

I've been finding it increasingly difficult to use Factual due to use of a deprecated method:

http://docs.guava-libraries.googlecode.com/git-history/v14.0.1/javadoc/com/google/common/io/Closeables.html#closeQuietly(java.io.Closeable)

I've bumped the version to 17.0 and because the new method fits with the Class hierachy I did not need to make code changes:

BufferedReads -> Reader -> Closable