Merge pull request #62 from pekrau/master

Added CSV file upload; first version
added streesstest and fixed a small error
Merge pull request #63 from Galithil/master

added stresstest and fixed a small error
added deletion to each level through the api
corrected several mistakes pointed out by the tests
Merge branch 'master' of https://github.com/NationalGenomicsInfrastructure/charon
reformated the stresstest, removed the scilifelab import
compatibility with 2.6
Merge pull request #63 from NationalGenomicsInfrastructure/master

get Denis latest changed into my fork