Fixed: query builder respects custom pagination params

[kdonovan]

Fixes an issue I was running into where the custom pagination params I set weren't being used when generating pagination queries.

[chingor13]

Can you make this test a separate one with a separate test resource? This changes the behavior of that one test and we lose it's original intent.

[kdonovan]

Can do -- just added a new file for the param name test.

[ouranos]

@chingor13 @kdonovan this seems to introduce a regression as the default pagination params are now page and per_page as defined in JsonApiClient::Paginating::Paginator.
Before this change it was number and size.

Edit: to fix the issue I added this to an initializer:

JsonApiClient::Paginating::Paginator.page_param = 'number'
JsonApiClient::Paginating::Paginator.per_page_param = 'size'

[kdonovan]

I feel like page/per_page is more in line with standard Rails defaults, but good catch -- that should have been documented better.

Thanks for providing the initializer fix for anyone bitten by that change!