Add comparing files having bnodes

Move a test method to an abstract test class
Add urn validation, see #358
Fix issue with empty lines
Add all GND preferredName* properties for literal resolution (#318)
Change metafacture dependency from 2.0.0-SNAPSHOT to 1.2.0
Change metafacture dependency from 2.0.0-SNAPSHOT to 1.2.0
Change metafacture dependency from 2.0.0-SNAPSHOT to 1.2.0
Update lodmill-ld dependency
Merge pull request #371 from dr0i/fix-empty-line-conversion

Fix empty line conversion, resolve GND labels, tweak dependencies
Merge pull request #367 from dr0i/comparingFilesWithBnodes

Add comparing files having bnodes
Merge pull request #369 from dr0i/issue-358

Add urn validation, see #358
Corrected URIs of properties urn & hbzID.
Merge pull request #376 from acka47/context-adjustment

Correct URIs of properties "urn" & "hbzID".
Merge pull request #368 from dr0i/issue-360

Add subjects for NWBib and RPB
Correct spelling of tableOfContents.
Merge pull request #377 from acka47/context-adjustment

Correct spelling of tableOfContents.
Add necessary 'rpb' prefix for dct:isPartOf

* add '^' so that regex only matches if string is starting with 'rpb'