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 used medium-editor for a nice looking html editor. I am not 100% confident I am doing html santization/validation correctly, but I would rather just switch to markdown than risk it.