Validator for config | create table

Now that we are deciding on our config structure for creating a table it would be good to have a validator function to ensure its valid.
This includes:
- [x] Table Name present
- [x] fields object present and has values which have valid type properties
- [x] All field names and table name are [valid postgres names](http://www.informit.com/articles/article.aspx?p=409471)