added Vignette PostFx Shader

Vignette PostFx added to the postFxManager
added sunBokeh PostFx Shader by Felix Willebrand Westin

This shader is set in the LevelInfo Tab
under  flareType set it to
flareType = "Sunlight";

Resource by Felix Willebrand Westin
http://www.garagegames.com/community/resources/view/22785
added Selection PostFx Shader by Konrad Kiss and Smally

To turn this feature on, enter SelectionPostFx.enable() at the console,
and make sure you use setSelection on a ShapeBase in view.

If you want to change the color, here's where you'll need to make
modifications in selectionShaderP.hlsl:

float4 e = float4(vis, 0, 0, vis); // <-- silhouette color
float4 ovr = float4(avgval, 0, 0, avgval); // <-- overlay color

ovr *= 0.4; // <-- overlay "thickness" (0.4 = 40% transparency for the
overlay)
Fixed missing mit headers and uploaded missing selectionShaderP.hlsl
added PostFX Library by Andy J Edmonds

This adds a selection of PostFx`s to Greed

*Pixelation
*Blurred Vision
*Dream View
*Cross Stitch
*Posterisation
*Night Vision
*Chromatic Aberration
*RGB sliders
*Zoom Blur
*Negative
*Black and White
*Monochrome
*Edge Detection

Usage:
Press alt-m in-game to bring up the control GUI. The effects can of
course be controlled via script - just see PFX_Library.cs for the
PostEffect names as well as the variables to control the look of them.
Update README.md

removed obsolete text
-fix sunBokeh Level issue and PostFx Library Gui issue

- sunBokeh was not working
Scattersky has to be named Sunlight
and flaretype has to be set to NullLightFlare to make sunBokeh work.

-PostFx Library
changed binding from
moveMap.bind( keyboard, "alt m", postFXGuiToggle );
to
GlobalActionMap.bind( keyboard, "alt m", postFXGuiToggle );
Merge pull request #1 from 7Sins/postFx

Integration of library shaders, a new sunglare effect, a vignette effect by jolinar.