added item and link tests
added URL_PROTOCOL defaults
replaced ID_FIELD by item_lookup_field on item link generation
Merge branch 'develop' of github.com:jrvidotti/eve into jrvidotti-develop

Conflicts:
	eve/default_settings.py
	eve/methods/get.py
``HATEOAS`` item links
Merge branch 'jrvidotti-develop' into develop. Closes #256.