add source's pointer, parameter

[wjdrudgh]

error object need 'source' property

and it need 'parameter', 'pointer'

[joshdholtz]

@wjdrudgh Thanks for the contribution! Do the unit tests pass locally? I think travisci is having issues.

[wjdrudgh]

I already using this on my project

[joshdholtz]

That's great but I still want to make sure the unit tests pass before I merge since it seems like travisci might be having issues 😇

[wjdrudgh]

Okay, I'll put some nil check to get parameters

[joshdholtz]

Thank you 😊

[wjdrudgh]

source must be key-value object
http://jsonapi.org/format/#errors

basic error example
http://jsonapi.org/examples/#error-objects-basics