Common data

[goganchic]

Implements #467

[kylef]

Hi @goganchic, to prevent any wasted work here I'd recommend you first create an proposal for the syntax as outlined in the contribution guides: https://apiblueprint.org/support.html#api-blueprint-request-for-comments. I think it would be a good idea here to get a consensus on the syntax before its implemented.

[goganchic]

Hi @kylef . Thanks for you comment. I'll take a look at this guides.