Don't output literal type if there isn't one for R2RML
Handle [*] at beginning of JSONPath
Added support for searching for HNodes by column name
Remove extra quotes from R2RML templates
R2RMLJenaModelParser properly parses triple maps with no predicates, but a valid template

Now generates CLASS_INSTANCE_LINK predicate as long as a
ColumnTemplateTerm is present so it gets processed by the
KR2RMLWorksheetRDFGenerator
Initial support for generating R2RML templates by parsing PythonTransformations

Added PythonTransformationAsURITokenizer plus tokens
Added PythonTransformationAsURIValidator
Added PythonTransformationToTemplateTermSetBuilder