Add initial pass at splitting meta out
Add backwards compatibility shims for meta methods
Add missing permissions method
Use correct variables
Use old error codes for backwards compatibility
Switch tests to new meta class
Correct inline docs
json_prepare_post never sends a WP_JSON_Response

The filter is used in the prepare_post method, which only returns data.
Any extra headers/etc need to be added in a higher level.
Merge branch 'master' into split-meta-class
Add inline documentation for meta methods
Update inline docs to match standards
Merge branch 'master' into split-meta-class
Merge branch 'master' into split-meta-class
Minor sprintf() spacing fixes for WP_JSON_Meta class.
Correct fatal error in WP_JSON_Meta_Posts->insert_post_meta().

Undefined method WP_JSON_Meta_Posts::handle_post_meta_action().
Renamed to new class method $this->handle_inline_meta().
Set meta id to an integer when checking against the parent id.

Resolves issue where creating meta for a post_id was returning an error.
Create a new Response object in WP_JSON_Meta_Posts->add_meta().

Resolves PHP warning that Headers were already sent from duplicate use of json_ensure_response on the the same response object.
Fix test_add_meta() to expect an object response.
Small spacing fixes for WP_Test_JSON_Posts_Meta class.
Merge pull request #358 from WP-API/split-meta-class

Split meta endpoints into separate class