Data Validation Support

[rufuspollock]

Validate (tabular) data against schema using https://github.com/okfn/json-table-schema-validator

• [ ] Support validating all files or just one selected file from resources - just columns and types
  • [ ] Load from CSV
  • [ ] Pass to JSON Table Schema Validator
• [ ] Support for constraints
• [ ] Support pointing at a random data file (not just one already in datapackage.json)

[pwalsh]

We can do this shortly using https://github.com/frictionlessdata/jsontableschema-js