Protobuf does not exits anymore in Google Code, today exists in GitHub.
Updating url for protobuf.

The headers were pointing to the old github wiki. Since we've officially
moved to Confluence, these links should be updated.

allow for mapred/yarn resource config

use default mapreduce memory settings

corrected defaults for m1.medium, added yarn scheduler vars

testing with increased yarn am resource

remove task.io settings, defaults to AWS recommended

testing new hadoop conditional configuration

iter dict for conditional config