v2.5.1

Enhancements:

• Stop enforcing the existence of scrapinghub-entrypoint-scrapy in shub image test to allow non-Python projects
• Fix inconsistencies in parameter names between shub and shub.image: Debug output is now enabled via -v everywhere, release versions can now be specified via -V everywhere
• Add -h as an alias for --help

Bugfixes:

• Clean up Docker containers properly after tests