*   Added locate_many(ignore_missing: true) option that'll use #where instead of #find for bulk location,
    which via Active Record means missing records will be ignored instead of raise an exception.

    *DHH*

*   Fixed that purpose should be passed on when using Locator.locate_many_signed(strings, for: 'purpose').

    *DHH*

*   Added #to_gid_param and #to_sgid_param as short-cuts for to_gid.to_param and to_sgid.to_param for convenience.

    *DHH*

*   Added support for Locator.locate_many and Locator.locate_many_signed to efficiently fetch many models.

    *Tom Ward, DHH*
