[Spec::DSL] Update docs to reflect a complete spec
[WIP][Podfile] Add YAML support
[Podfile] Add YAML support
[TargetDefinition] Simplify inheritance
[TargetDefinition] Docs
[Spec::DSL] Update docs to reflect a complete spec
Merge branch 'Podfile-YAML'

* Podfile-YAML:
  [TargetDefinition] Docs
  [TargetDefinition] Simplify inheritance
  [Podfile] Add YAML support
  [WIP][Podfile] Add YAML support
  [Spec::DSL] Update docs to reflect a complete spec

Conflicts:
	spec/podfile/dsl_spec.rb