Fix _getTransitiveClosure: there was maximum one parent class in the list

But if you have more than one parent class on top, with this fix all of
them are now in the list.
Merge pull request #49 from larseidam/develop

fix rdf import warning by turtle/n3 files
Integrated newer cache support.
Reverted last change because commit went to wrong repository.
Integrated newer cache support.
Fix code style.
Fix getModelOrCreate method in Store
Cleanup after integration of newer cache.
add commit message note link
Update configuration of new central cache and mark deprecated method getCacheDir to be renamed to getTempDir.
Quit cache backend setup with exception if memcache server is set to be used but not available.
modifying the workflow of enabling the versioning functionality in a way that Erfurt do not crashed while using the SPARQL backend
Enabling the sparqlAsk functionality in the Sparql backend
avoid FPATH usage which is an important zsh var
strip whitespaces
avoid date TZ warnings
Improve default values and documentation of cache configuration.
Rename method getCacheDir to getTempDir and deliver path to temporary directory, provided by operating system.
Check existance and write rights of cache folder.
Use fake cache backend if cache is not enabled.