Post values should only be saved to the microblog

At the time of writing this issue, the module defined a field_social_post_controller. All code related to this field has been removed, and usage of this module now depends on inline_entity_form. Currently, however, the usage and configuration of inline_entity_form is not automated by the module at all. This will either require documentation and/or some more work. Switching to this model means that the post values now only exist on the microblog node.