Added a check for the _init__.pu files and fixed the test case_15
Merge branch 'master' of github.com:gem/oq-engine into check__init__
Added two forgotten files
Added the new expected results
Removed the .csv export feature, since it is still experimental
Merge pull request #1473 from gem/check__init__

Added a test checking the existence of the __init__.py files and fixed the QA test classical/case_15