Add support for blank nodes
This release adds support for blank nodes in RDF import data, thus closing issue #35 .
In brief, a construct like:
ex:someSubj
ex:hasInfo [ rdfs:label "someLabel" ; ] .
... will result in a link on the SomeSubj page, to an intermediate page named "Blank node [6-digit id]", on which the rdfs:label fact will be inserted.
Some minor code refactorings to improve code quality were also made.
Note: RDFIO does not yet support later versions than MediaWIki 1.27 and Semantic MediaWiki 2.4.