Add DSL for assocations
Merge pull request #602 from JordanFaust/add-dsl-for-assocations

Add DSL for associations
ruby syntax highlights
Merge pull request #607 from zigomir/patch-1

ruby syntax highlights
serializer_for Array
Tests for ActiveModel::Serializer.serializer_for for not array serializer
Merge pull request #610 from bolshakov/feature/array_serializer

ArraySerializer
* Rename NullAdapter to SimpleAdapter
* Introduce abstract Adapter class
* Organaze test structure to match convemtions
Add NullAdapater
* Configure adapter using ActiveModel::Serializer.config.adapter
* Get adapter instance using ActiveModel::Serializer::Adapter.adapter_for(serializer)
Serializer should be available wiithing adapter to inspect attributes and assotions
Test for SimpleAdapter#serializable_hash
Test for NullAdapter#serializable_hash
Concrete adapter should provide serializable hash for Adapter#to_json method
Move Adapter.adapter_for to Serializer.adapter
Add Serializer#associations
README: typo fix on attributes
Fix rails 4.0.x build
Dont allow failures on 4.0.x
Add .ruby-version to gitignore