add option to export result to CSV

This will add an option to export a result of a SPARQL query
as CSV. Note that this will only work with when the corresponding
feature of Erfurt is also checked out.
add option to export result to CSV

This will add an option to export a result of a SPARQL query
as CSV. Note that this will only work with when the corresponding
feature of Erfurt is also checked out.
Rebase CSV branch onto develop
Merge CSV export into rdfauthor-FormBuilder