Support of connection URIs containing credentials

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Minor : remove trailing spaces

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Exceptions  are now located in RDF::Sesame

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Add :context accessor in RDF::Sesame::Repository

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
RDF::Repository#clear now support options (subj, pred, obj, context)

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Merge pull request #8 from PerfectMemory/master

Merge with PerfectMemory:master