List of changes for recipe v2.

[remimimimimi]

Here's the list of changes that we would like to have in recipe v2.

Two first inconsistencies that come to mind are source and license_file both singular in name, but plural in fact since they can accept list of sources and license files correspondingly.

• Rename source to sources or allow both source and sources for single and multiple elements correspondingly.
• Rename license_file to license_files or allow both license_file and license_files for single and multiple elements correspondingly.

Please write your other ideas here @wolfv.