Split comments into separate class
Add deprecated shim comment methods
Merge branch 'master' into split-comment-class
Initial pass at basic tests for get_comments and get_comment.
Merge branch 'master' into split-comment-class
Add test for get request of comment with parent.
Merge branch 'master' into comment-unit-tests
Merge branch 'master' into split-comment-class

Conflicts:
	lib/class-wp-json-posts.php
Merge branch 'comment-unit-tests' into split-comment-class
Correct endpoints class for base unit tests.
Create global function to check read permissions on objects.
Create global function to check edit permissions on objects.
Deprecate permission check methods in Post controller in favor of global functions.
Update permission checks in Post controller to use new global functions.
Restructure logic in read and edit permission checks to return correct response.
Update read permission checks in Post controller to use global function.
Replace edit permission check in Post Meta controller with global function.
Remove Post Meta check edit permission method in favor of global.
Correct spelling of permission variable.
Replace inline edit capability checks with json_check_edit_permission().