Added sample data for testcase to test JSONRDFGenerator
Merge branch 'load_r2rml_from_url' of https://github.com/InformationIntegrationGroup/Web-Karma into load_r2rml_from_url. Added testcase for JSONRDFGenerator

Conflicts:
	src/main/java/edu/isi/karma/rdf/JSONRDFGenerator.java
Merged JSONRDFGenerator