Add DSL for urls
Support Rails 4.2.0

This patch is the same fixes as #655 and #663 .
Merge pull request #675 from tricknotes/support-rails4.2

Support Rails 4.2.0
Add support for embed: :ids option for in associations
add support for root keys

remove debugging gem

fix white space
Check superclasses for Serializers
Merge pull request #680 from NullVoxPopuli/add-root-option

Add support for root keys
Merge pull request #681 from quainjn/inherited-serializer

Check superclasses for Serializers
Merge pull request #677 from ride/embed-ids-option

Add support for embed: :ids option for in associations
Merge pull request #625 from JordanFaust/feature/url-dsl

Add DSL for urls