Hook set_properties() after the default priority

Helps ensure taxonomies or post types registered on "init" at priority
10 are included.
Merge pull request #23 from alleyinteractive/late-init

Hook set_properties() after the default priority
Use WP_SEO::format() on arbitrary tags
Merge pull request #25 from alleyinteractive/format-arbitrary-tags

Use WP_SEO::format() on arbitrary tags
Merge branch 'master' into tests

Conflicts:
	php/class-wp-seo-settings.php
Call set_properties() on wp_loaded

Fixes #24