fix for server and agent to have different pid and log files
Merge pull request #65 from ChrisLundquist/uniq-pid-log

fix for server and agent to have different pid and log files
Use sha256 checksums instead of md5.

Chef only supports sha256 checksums for remote_file right now.
Merge pull request #66 from meineerde-cookbooks/fix/checksum-for-logstash-1.1.9

Use sha256 checksums instead of md5.