fixed minor detail serializing prefix mappings to rdfa
Updated to Sesame 2.7.11

Ignoring some tests from the sesame-testsuite because KiWi supports transaction isolation.
MAROTTA-395: stabilized integration test for the marmotta-webapp archetype
MARMOTTA-478: Fixed encoding for the archetype dummy tests.
removed Andy Seaborne from the authors list, he's not a committer.

http://marmotta.apache.org/acknowledgements.html
MARMOTTA-481: removed experimental tag from marmotta-ldp, added by default to marmotta-webapp and marmotta-installer.