Add RFC for deprecation Ember Data initializers

text/0181-deprecate-ember-data-initializers.md

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+- Start Date: 2016-11-22
+- RFC PR: (leave this empty)
+- Ember Issue: (leave this empty)
+
+# Summary
+
+The goal of this RFC is to remove the `data-adapter`, `injectStore`,
+`transforms`, and `store` Ember application initializers that Ember Data injects
+into apps.  The `ember-data` initializer will not be changed and any code
+that previously depended on the ordering of these initializers (via
+the `before` or `after` properties on an initalizer) can be
+changed to use the `ember-data` initializers for ordering.
+
+# Motivation
+
+The initializers `data-adapter`, `injectStore`, `transforms`, and
+`store` have not been used by Ember Data since
+[Apr 8, 2014](https://github.com/emberjs/data/commit/d25e23f622a3677b8372db535b2ab824ad306a16). However,
+they are still injected into every Ember app that depends on Ember
+Data because existing apps may depend on these initializers
+for ordering their own initializers to run before or after Ember
+Data's setup code.
+
+Removing these initializers will help reduce the amount of code Ember
+Data needs to support.
+
+Since these initializers are noop functions that run after the
+`ember-data` initializer, any initializers that depends on one of the
+deprecated initializers listed in this rfc can easly be replaced by
+depending on the `ember-data` initializer instead.
+
+# Detailed design
+
+Ember Data's instance initializer will start checking for any
+initializers whose `before` or `after` properties depend on one of
+these deprecated initalizer. If it finds an initalizer that references
+one of the deprecated initalizers, Ember Data will then log a
+deprecation message that states the name of the offending initalizers
+and suggest changing the `before` or `after` property (the deprecation
+message will refer to the correct property dynamically) to depend on
+Ember Data instead.
+
+This deprecation message will continue to appear until Ember Data
+3.0.0 when these initalizers and the deprecation code will be finally
+removed.
+
+
+# How We Teach This
+
+This change should have no impact on how we teach Ember or Ember
+Data. The initalizers that will be removed have been unused for a long
+time and are not mentioned anywhere in today's guides or API docs.
+
+Users who need to run initalizer code before or after Ember Data
+injects the store into routes should be taught to use `before:
+'ember-data'`, or `after: 'ember-data'` on their initializers.
+
+# Drawbacks
+
+- This change will require users who depend on these deprecated initalizers to update their code.
+
+# Alternatives
+
+- We could leave the noop initalizers in Ember Data and continue to support them in Ember Data 3.0.0 and beyond.
+
+# Unresolved questions
+
+None