Gplus needs better debugging output

[nfm]

OAuth2 only raises OAuth2::Error exceptions. While this is the correct behavior (it's a general purpose tool and shouldn't have to know anything about specific Google+ errors), it makes debugging a real pain in Gplus.

Gplus needs to raise sensible, Google+ specific exceptions, including the error messages returned from Google+.

@tompata, you mentioned in #1 that "debugging is very difficult now". How are you currently debugging Gplus, and is it more difficult in 2.0.0? Would Gplus raising specific exceptions (instead of not catching OAuth2::Errors) be helpful?

[tompata]

Hi @nfm,

i was debugging with OAuth2::Error exception details, for example exception.response.inspect

but it would be also useful if i could see (with a debug option) the URLs of the communication, and if error happened, the details of the error