Adding concern for supporting presentation data.
This data is edited as YAML and consumed through a cached Hash version.
load YAML using safe_load instead of load for security reasons.
This will raise an error if you try to set anything other than primitive types.
Updating travis config file.
Removing 2.0.0 since we are not using that version anymore (and since it doesn't have the latest version of Psych)
Bumping 2.1.0 to 2.1.1 since that is what we are using on all our servers now.
Merge pull request #131 from biola/adding_presentation_data_support

Adding presentation data support