Models and associations

* Comment
    * [ ] create model
    * [ ] has one post
    * [ ] has many commentmeta
* Options
    * [ ] create model
* Posts
    * [x] create model
    * [x] has many postmeta
    * [ ] has many term-taxonomies (through `term_relationships`)
    * [ ] has one user (author)
* Postmeta
    * [x] create model
    * [x] has one post
* Terms
    * [ ] create model
    * [ ] has many taxonomies (through `wp_term_taxonomy`)
* Term taxonomies
    * [ ] create model
    * [ ] has one taxonomy
    * [ ] has one term
    * [ ] has many posts (through `term_relationships`)
* Term relationships
    * [ ] create model
    * [ ] has one post
    * [ ] has one term-taxonomy
* Users
    * [ ] create model
    * [ ] has many posts
    * [ ] has many usermeta
* Usermeta
    * [ ] create model
    * [ ] has one user