Allow the title to be set via title.raw.
post_title, not post_content.
Added test for *.raw post data.
Merge pull request #741 from avryl/title-raw

Allow the title to be set via title.raw
Fix some incompatible interfaces

* `WP_HTTP_Response` should declare its properties
* `WP_JSON_CustomPostType` and `WP_JSON_Media` have some out of date
method calls
* Remove some dead variable assignments
Merge pull request #742 from WP-API/fix-646

Fix some incompatible interfaces