use JSON instead of YAML for loading samples.json
prefer JSON, but fall back to YAML if JSON isn't available
Merge pull request #806 from github/use-json-for-loading-samples

Use JSON instead of YAML for loading samples.json
require escape_utils >= 0.3.1
force escape_utils 0.3.2 on ruby < 1.9.3
Merge pull request #807 from github/update-escape_utils-dep

Require escape_utils >= 0.3.1