Some exception handling and logging improvements
Merge branch 'master' of https://github.com/Nanopublication/nanopub-store-api

Conflicts:
	src/test/java/nl/lumc/nanopub/store/api/utils/NanopublicationFileOperation.java
Merge origin/master
Merge origin/master
Remove rdf2go dependency, add Sesame dependencies
Merge branch 'master' of https://github.com/Nanopublication/nanopub-store-api.git

Conflicts:
	pom.xml
	src/test/java/nl/lumc/nanopub/store/dao/impl/NanopubDaoImplTest.java

Signed-off-by: Reinout van Schouwen <reinout@gmail.com>