Use YAML.safe_load when loading custom config
Use YAML.safe_load when loading custom config

There's a vulnerability in `YAML.load` which can enable arbitrary code to be run
on our sytems. `YAML.safe_load` does not deserialize unsafe classes.

Related reading:
http://blog.codeclimate.com/blog/2013/01/10/rails-remote-code-execution-vulnerability-explained/
https://github.com/tenderlove/psych/issues/119
http://docs.ruby-lang.org/en/2.1.0/Psych.html#method-c-safe_load

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