Adding proposal for what's new for 2.1

what's new - 2.1 - proposal.md

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+- 2.1.0:
+ - **Major updates**
+ - Unity 5  scene exporter. More info [here](https://github.com/BabylonJS/Babylon.js/tree/master/Exporters/Unity%205) ([davrous](http://www.github.com/davrous), [deltakosh](http://www.github.com/deltakosh))
+ - New ```Mesh.CreateDecal()``` function to create decals. See [demo](http://www.babylonjs.com/?DECALS). More info [here](http://doc.babylonjs.com/page.php?p=25094) ([deltakosh](http://www.github.com/deltakosh))
+ - New tool for debugLayer: You can now dump renderTargets to see their content ([deltakosh](http://www.github.com/deltakosh))
+ - Complete shadows code rework: New bias property for ShadowGenerator, new orthogonal shadows for directional shadows, 
+   automatic projection size for directional lights, new BlurVarianceShadowMap filter. See [demo](http://www.babylonjs.com/?SOFTSHADOWS). Documentation updated [here](http://babylondoc.azurewebsites.net/page.php?p=22151) ([deltakosh](http://www.github.com/deltakosh))
+ - New lens effects rendering pipeline. More info [here](http://doc.babylonjs.com/page.php?p=24841) ([jahow](https://github.com/jahow))
+ - New basic mesh type: Ribbons. See [demo](http://www.babylonjs.com/?RIBBONS). More info [here](http://doc.babylonjs.com/page.php?p=25088) ([jbousquie](https://github.com/jbousquie))
+ - New ```BABYLON.Mesh.ExtrudeShape``` and ```BABYLON.Mesh.ExtrudeShapeCustom```. More info [here](http://doc.babylonjs.com/page.php?p=24847) ([jbousquie](https://github.com/jbousquie))
+ - **Updates**
+ - Faster ```mesh.computeNormals()``` function ([jbousquie](https://github.com/jbousquie))
+ - Added mesh.freezeWorldMatrix() for static meshes ([deltakosh](http://www.github.com/deltakosh))
+ - Added mesh.alwaysSelectAsActiveMesh to disable frustum clipping for a specific mesh ([deltakosh](http://www.github.com/deltakosh))
+ - Added updateMeshPositions method ([jbousquie](https://github.com/jbousquie))
+ - Callbacks for geometry changes ([raananw](http://www.github.com/raananw))
+ - Material onBind callback improvement ([jahow](http://www.github.com/jahow))
+ - New front/back/double side feature for meshes ([jbousquie](https://github.com/jbousquie)) 
+ - New basic mesh type: Disc ([jbousquie](https://github.com/jbousquie))
+ - New basic mesh type: Tube. More info [here](http://doc.babylonjs.com/page.php?p=24847) ([jbousquie](https://github.com/jbousquie))
+ - Allow ComputeNormals to work with Typed Arrays & the Typescript Level ([Palmer-JC](http://www.github.com/Palmer-JC))
+ - Added uniqueId for nodes ([raananw](http://www.github.com/raananw))
+ - Added ```Mesh.onLODLevelSelection(distance: number, mesh: Mesh, selectedLevel: Mesh)``` callback ([deltakosh](http://www.github.com/deltakosh))
+ - Added ```Material.zOffset``` to help reducing z-fighting ([deltakosh](http://www.github.com/deltakosh))
+ - Added excludeWithLayerMask to lights ([Palmer-JC](http://www.github.com/Palmer-JC))
+ - Added includeOnlyWithLayerMask for filtering meshes ([Palmer-JC](http://www.github.com/Palmer-JC))
+ - Mesh Default layerMask changed to allow more "special cameras filtering" ([Palmer-JC](http://www.github.com/Palmer-JC))
+ - Sprite can now have .width and .height properties ([deltakosh](http://www.github.com/deltakosh))
+ - Ability to register events based on mesh/camera/light addition and deletion ([raananw](http://www.github.com/raananw))
+ - New ```Curve``` object ([jbousquie](https://github.com/jbousquie))
+ - New 'color correction' post process ([jahow](http://www.github.com/jahow))
+ - Added sampling mode as a parameter for SpriteManager ([jahow](http://www.github.com/jahow))
+ - RenderTexture can now be saved to a file ([deltakosh](http://www.github.com/deltakosh))
+ - Better attributes management ([deltakosh](http://www.github.com/deltakosh))
+ - Source conform to typescript 1.4 ([raananw](http://www.github.com/raananw)) 
+ - Adding subMeshId property in PickingInfo structure ([deltakosh](http://www.github.com/deltakosh))
+ - No more error when a manifest is not found ([deltakosh](http://www.github.com/deltakosh))
+ - ** Bug fixes **
+ - Initial quaternion fix for OIMO plugin ([raananw](http://www.github.com/raananw)) 
+ - ArcRotateCamera pinch zoom debug ([vousk](https://github.com/vousk)) 
+ - Fixing animatable bug when animation is over ([temechon](http://www.github.com/temechon))
+ - useCameraPostProcess whenever there is a special camera in use ([m0ppers](https://github.com/m0ppers))