EXIF support for local metadata plugin.

[Igor Tarasov <i s tarasov gmail com>]

Dear Grilo Developers,

Grilo framework is perfect but in the lack of EXIF support makes
it almost useless for managing local images.  Is there any plans
about EXIF support in local metadata plugin? If not not, please
tell me would you like to accept patches to fix this issue and
libexif dependency as well? :)

I'm working on photo collection application, I'm  using grilo and I'll
implement this functionality anyway. The question is, what do
you think about pushing it into the local metadata plugin?

Best regards,
Igor Tarasov.