Fix https://bugs.launchpad.net/oq-engine/+bug/1226102
Fixed https://bugs.launchpad.net/oq-engine/+bug/1226061
Fixed a comment
Added forgotten __init__.py files
Merge pull request #1286 from gem/qatest-for-multiple-sites

QA test for multiple sites
Merge branch 'master' of http://github.com/gem/oq-engine into fix-blocksize-conservative
Distribution per ruptures, not per sites