fixed override of remove() method in ElasticsearchRDFGraph
Added minor changes in README, with a more explicit curl syntax, not depending on specific paths (relative to project folder).
Please drop the additions, if you don't like them.
Update README.md
Merge branch 'master' of https://github.com/seralf/elasticsearch-plugin-rdf-jena into seralf-master

Conflicts:
	README.md
	src/main/java/org/xbib/elasticsearch/module/rdf/jena/ElasticsearchRDFGraph.java