Add validation for primitive types

[jasonwalsh]

http://json-schema.org/latest/json-schema-validation.html

• [x] String
• [ ] Object
• [ ] Numeric (Integer, Number)
• [ ] Array
• [ ] Boolean
• [ ] Null

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Your issue doesn't follow our guidelines. Please fix the following:

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[ghost]

Your issue doesn't follow our guidelines. Please fix the following:

• Issue must have at least one label (?)
• Issue title must be in imperative, present tense (e.g. "add", "fix", "change") (?)

Click here for details.

Thank you! :pray: _{This comment was made by GitMagic – Magically enforcing your contribution guidelines.}

[ghost]

This issue still violates some of our guidelines:

• Issue must have at least one label (?)

Click here for details.

[ghost]

Thank you, everything looks good now! :bowtie: