Nice error message when trying to download unverified files.
minor fix for prettier location hash
Merge pull request #267 from grischa/master

When files aren't verified the file download now results in an error message instead of a 500 error
Fixed permission check for DatasetParameterSets, fixed bug in temp-dir file uploads
Merge branch 'mytardis-api' into synch-deployment
Merge branch 'master' into synch-deployment