Add YAML as an option for context files.#33

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jmarini wants to merge 3 commits intoaudreyfeldroy:masterfrom

jmarini:yaml-context

Commits on Mar 14, 2014

Added YAML as an option for context files. Using PyYAML as the parser for both JSON and YAML files.
jmarini
committed

Commits on Apr 21, 2014

Changed json files back to being parsed with builtin json module.
jmarini
committed
Added tests for yaml context files. Testing for yaml file with proper
jmarini
committed