Changes ORDER to Sequency in Models

We cant set ORDER as an attribute of a model as ORDER is meant to be used to tell endpoints which field will be sorting the query
Improves query_fields and Docs
Adds order to lists and gets

There was a problem with the list of items that were retrived inside another object: this collection of inner objects werent ordered as it should. This commit solves that and other minnor stuff.
Closes #10 and adds Tests
Merge pull request #22 from AEHO/feat/query-fields

Query fields and Inner object order in collection