Bumped version and updated changes

Author: andrewkaufman

Changes

@@ -1,3 +1,44 @@
+# 9.0.0-b4
+
+#### IECore
+
+- Added IECore::ClippingPlane object
+- Set __file__ when loading configs
+- Emitting a debug message for each config file loaded
+
+#### IECoreMaya
+
+- Added a mutex inside IECoreMaya::LiveScene::hasAttribute()
+
+#### IECoreGL
+
+- Wireframe shading uses Cs instead of vertexCs
+
+#### IECoreRI
+
+- Several IECoreRI::shader() optimizations
+- Added clipping plane support to IECoreRI::Renderer
+
+#### IECoreAppleseed
+
+- Refactored IECore primitive to appleseed entities conversions code.
+- Simplified IECoreAppleseed::RendererImplementation.
+- Use appleseed object alpha maps instead of material alpha maps.
+- Fixed a bug when trying to render a scene without cameras.
+- Use the names set with setAttribute to name the appleseed entities in generated appleseed scene files.
+- Highlight regions being rendered in the interactive display driver. Useful when doing multipass rendering.
+- Small refactors in the display driver code.
+- Removed some unused headers and other formatting changes.
+- Camera and transformation motion blur support
+- Added as:automatic_instancing option to enable / disable auto-instancing.
+- Better error handling for as:mesh_file_format option
+- Better error handling for searchpath option. Added automatic_instancing option
+- Support for appleseed 1.1.2
+- Fixed bug when connecting members of stuct parameters in OSL shaders.
+- Added photon target attribute for objects
+- PrimitiveConverter interface changes. Changed the way hashes are computed in IECoreAppleseed.
+- Fixed assembly instance names when generating appleseed projects.
+
 # 9.0.0-b3
 
 #### IECore

SConstruct

@@ -53,7 +53,7 @@ SConsignFile()
 ieCoreMajorVersion=9
 ieCoreMinorVersion=0
 ieCorePatchVersion=0
-ieCoreVersionSuffix="b3"	# used for alpha/beta releases. Example: "a1", "b2", etc.
+ieCoreVersionSuffix="b4"	# used for alpha/beta releases. Example: "a1", "b2", etc.
 
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 # Command line options