Merge pull request #116 from scor/master

Rename getNodeId() to getBNodeId() and isBnode() to isBNode()
Stopped using empty() in EasyRdf_Namespace::expand() to check parameter (fixes #114)
Merge branch 'master' of github.com:njh/easyrdf
Fix for dumping SPARQL SELECT query with unbound result (#112)
Passing  by reference is not necessary in expandCurie(), processUri(), getUriAttribute() and processNode()