Data validation is too brute

[dimaursu]

https://github.com/Raven24/diaspora-federation/blob/master/lib/diaspora-federation/salmon/encrypted_slap.rb#L115

This is kinda harsh for developers, requiring to have author_id of type string. We can convert that on our own, with a simple .to_s ; I think it's more important to check if all the content of author_id are digits.

[Raven24]

yeah, you're probably right... that's one of my java-isms when I don't remember ruby supports duck typing ;)