Give - Recurring Donations 2.7.0

* Fix: Custom amounts can now be either recurring or non-recurring based on your giving preference.
* Fix: The "Subscriptions Page" setting was missing in Give's general settings due a change in the previous version. It has now been restored.
* Fix: PHP warning "invalid subscription_id error" while donating and using the {subscription_frequency} email tag.

* Tweak: Improved internationalization of the donor's choice checkbox language string.
* Fix: Improved SQL query structure for DB upgrade having issues on some database environments.
* Fix: PHP notice when clicking on a custom amount level.

* Fix: The update routine supposed to be release in 1.5.3 wasn't properly merged therefore we need this new release to ensure it goes out to everyone as expected.