Updated release notes

Entitas/Entitas/entitas_version

@@ -1 +1 @@
-0.27.0
+0.28.0

EntitasUpgradeGuide.md

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+# Entitas 0.28.0 upgrade guide
+
+If you're using Entitas with Unity, please open the Entitas preferences and make
+sure that all your desired code generators are activated.
+Due to some code generator renamings the ComponentIndicesGeneratoris inactive.
+
+The SystemsGenerator has been removed. Please use `pool.CreateSystem<MySystem>()` instead.
+
+
+
 # Entitas 0.27.0 upgrade guide
 
 If you're using Entitas with Unity, please open the Entitas preferences and make

RELEASE_NOTES.md

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+# 0.28.0
+
+##### Breaking changes
+Please follow the [Entitas upgrade guide](https://github.com/sschmid/Entitas-CSharp/blob/master/EntitasUpgradeGuide.md)
+
+##### Entitas
+- Added documentation (#55)
+- Added an object pool for components (#58)
+- Added pool.ClearComponentPool(index) and pool.ClearComponentPools()
+- Added ENTITAS_FAST_AND_UNSAFE compiler flag. When set it will speed up e.Retain() and e.Release() (#59)
+
+##### Entitas.CodeGenerator
+- Generated component extensions are now reusing components using a component object pool when destroying entities (#58)
+- Added tests for testing the logic of generated files
+- Decoupling code generation logic by adding Code Generator Intermediate Format (#62)
+- Added TypeReflectionProvider
+- Supporting components with namespace
+- Simplified linq expressions
+- Removed generated systems
+- The Code Generator is not depending on Entitas anymore
+
+##### Entitas.CodeGenerator.TypeReflection
+- Added Entitas.CodeGenerator.TypeReflection project
+
+##### Entitas.Unity
+- Added `keys` and `values` getter to Properties
+
+##### Entitas.Unity.Migration
+- Added Entitas.Unity.Migration which provides an easy way to migrate source files
+- Added header image and current version label to Entitas Migration Window
+
+![Entitas.Unity.Migration](https://cloud.githubusercontent.com/assets/233700/12795026/6acf24b4-cab8-11e5-90e3-98a103676d50.png)
+
+##### Entitas.Unity.VisualDebugging
+- Added system search field to DebugSystemsInspector
+- UI tweaks and performance optimizations
+- Fixed logging wron system stats
+- Added header image and current version label to Entitas Preferences Window
+
+![Entitas.Unity.Visualdebugging-preferences](https://cloud.githubusercontent.com/assets/233700/12795069/a13e5b6e-cab8-11e5-937d-870790e2bfe1.png)
+
+##### Other
+- Removed redundant files and gitignored Entitas in all Unity projects (#63)
+- Removed Unity projects from Entitas.sln
+- Removed warnings
+
+
 # 0.27.0
 
 ##### Note