correct exception handling
refactoring test management
dbpedia test case
new test for inserting already exisiting triples and deleting not
existing triples
refactoring
merge getFullGraph() and getReferenceGraph()
closes #19, closes #20

new insert method: directly stores changes in seperate graphs, then
elimating doubles; merges into reference and add meta information

should scale better (no COPY and DIFF required)
fix regex pattern deu to DOT_ALL option
remove not longer supported INSERT query
dbpedia preparation is ready now
correct mime type handling in getRevisionInformation()
fix encoding issue