Fix incompatibility with Rails 4.2.5.1 from a change to find_templates

[gabriprat]

Rails 4.2.5.1 made a change to find_templates. It now takes 5 arguments:

• def find_templates(name, prefix, partial, details)
• def find_templates(name, prefix, partial, details, outside_app_allowed = false)

Adapting this resolver to admit the 5th argument.

[iox]

Thanks for the patch Gabri, though Paul fixed this the exact same thing a few days ago :). Hope to hear more from you!