13cantusespinning

- changed all filter to priority 9 instead of the default which is 10.
so it gets a priority over other plugins, e.g. content spinner, which
means, conversion first then spin.

PR for https://github.com/Link7/wp-token-manager/issues/13

NOTE: This PR is a branch of https://github.com/Link7/wp-token-manager/issues/11