multi author support

[wknd]

posts currently have 1 author, and if none is set defaults to the site author.
but what if several people collaborate and write a post? the author field could be an array of several people, there should be a way to deal with that.

[wknd]

This is done, and dealt with in the resources repo. There is a data structure to house the info about the authors.

[wknd]

my bad, I meant authors in general, no way to handle several authors yet