Adapt to Swift 3 and add hasPermission method

[natete]

No description provided.

[natete]

I'm not an expert in Swift but it looks like it's working.

The hasPermission method provides a method to check if the permission is granted before requesting it.

If you don't like any of the changes just close the PR, it's something we needed and maybe you can use it.
😄

[akofman]

Hey @natete ! Thanks a lot for this work, it looks awesome, I gonna check it and keep you in touch.

[akofman]

Okay so I've checked the PermissionScope lib and it seems it already supports Swift 3. I think it would be better to update this plugin with this new last version and its last improvements.

About the hasPermission method, actually the request*Permission methods already check whether the permission is granted before alerting the user. Knowing that do you still think it is convenient to add a hasPermission method ?

Thanks again for using this plugin ;)

[natete]

Sure, it's better to keep in sync with the lib and then adapt only the PermissionScopePlugin file.

Regarding the hasPermission, we implemented it because we were using it in a template pattern using the same workflow for both android and iOS but you can drop it if you consider it.

Thanks to you for creating this awesome plugin!

[akofman]

Thx ;) I'm waiting for this PR to be merged then I'll update this plugin.