Created basic post API using memory for (non)persistence

So I made a-couple decisions in how I think the core API should work but it is setup as follows. Version information is not baked into the url structure, but that could be easily added:

/api/                              = is root
/api/meta                      = reports version number, maybe other facts
/api/posts                     = returns a list of posts
/api/posts/<post_id>    = self-explanatory
/api/<other-object>      = authors, assets, etc.....

Also, what backend should we use? I want to use something that is primarily in memory.