Add spec on tube :  generic create bulk
Fix generate_script to not duplicate content-type in accet.

This script use the expected response header as header. This can cause
problem if the Content-Type is already present in the header section.
This commit removes duplicate.
Fix mime-type bulk spec output.
Bump version
Merge pull request #33 from maxigit/52616817_add_generic_bulk_creation_on_mime_type

52616817 add generic bulk creation on mime type