Fix for a NullPointerException that occurs when the hostname in the Spark Task Metrics is null

It's not clear under what circumstances this happens, but I've seen it when a job was cancelled part-way through
Merge pull request #349 from nfergu/fixnpe

Fix for a NullPointerException when hostname is null in Task Metrics
[ADAM-326] Moved files over to S3 to prevent tests from failing
Merge pull request #343 from genomebridge/retry-hrba

Allow retrying on failure for HTTPRangedByteAccess
[maven-release-plugin] prepare release adam-parent-0.13.0
[maven-release-plugin] prepare for next development iteration
Update the CHANGES.md after the 0.13.0 release
remove mention of uberjar from README
Merge pull request #362 from heuermh/remove-uberjar-doc

Remove mention of uberjar from README
[ADAM-364] Fixing remaining cs.berkeley.edu URLs.
Merge pull request #364 from fnothaft/fix-csberkeley

[ADAM-364] Fixing remaining cs.berkeley.edu URLs.
[ADAM-363] Adding maven assembly plugin configuration to create .tar.gz, tar.bz2, and zip tarballs
Merge pull request #363 from heuermh/assembly-config

[ADAM-363] Adding maven assembly plugin configuration to create .tar.gz, tar.bz2, and zip tarballs
[ADAM-339] Fixed MD tag creation failure when MD tag = 0.
Merge pull request #352 from fnothaft/fix-failing-mdtag

Fix failing MD tag
[ADAM-357] Added Java Plugin hook for ADAM.
Merge pull request #357 from fnothaft/java-plugins

[ADAM-357] Added Java Plugin hook for ADAM.
[ADAM-353] Fixing issue with SAM/BAM/VCF header attachment when running distributed.
[ADAM-351] Add simple support for symbolic alleles.
Merge pull request #354 from fnothaft/fix-distributed-legacy-output

[ADAM-353] Fixing issue with SAM/BAM/VCF header attachment when running distributed