Fix #60: Add script to clear cache via shell.
Merge branch 'develop' of https://github.com/AKSW/OntoWiki into develop
Extend cache clear script by support for query and translation cache.
add option to export result to CSV

This will add an option to export a result of a SPARQL query
as CSV. Note that this will only work with when the corresponding
feature of Erfurt is also checked out.
Rebase CSV branch onto develop