fixed R2RML translator
Merge branch 'feature/fix-r2rml' into develop
incorporate the johannes contribution on the direct-mapping
fix an issue with R2RML exporter

no need to put quotes in the table name for phisical-table
http://www.w3.org/2001/sw/rdb2rdf/r2rml/#physical-tables
re-enable the tests in quest-owlapi3
Merge branch 'develop' of github.com:ontop/ontop into feature/multiSchemaMartin