Renamed MayaScene to LiveScene
Renamed HoudiniScene to LiveScene
LinkedScene::hash now takes extra children at links into account
removed outdated comment
Merge pull request #327 from davidsminor/linkedSceneChildNameBoundHashes

updated LinkedScene hash functions now extra children are allowed at links
Added support for RiFrame blocks in IECoreRI::Renderer.

If the "ri:frame" option is specified, then it will be used to provide the frame number for the frame block.
Merge pull request #329 from johnhaddon/riFrame

Added support for RiFrame blocks in IECoreRI::Renderer.
Merge pull request #328 from andrewkaufman/liveScene

LiveScene rather than AppNameScene
updated changes, bumped version to 9.0.0-a5
multithreaded op and fixed ssd validation issue.
Merge pull request #331 from valeriebernard/multithreadedSkinningOp

multithreaded op and fixed ssd validation issue.
Added boost::hash compatibility for MurmurHash.

This means we can use MurmurHash as the key in containers like boost::unordered_map.
Merge pull request #332 from johnhaddon/murmurHashHash

Added boost::hash compatibility for MurmurHash.
Added HasBaseType to TypeTraits.h.
Added Renderer::ExternalProcedural class.

This is a lightweight class for use as a placeholder, specifying to a renderer backend that they must load the true procedural from disk.
Added ExternalProcedural object type.

This derives from VisibleRenderable, allowing a representation of an external procedural to be edited, saved, loaded, copied, hashed, grouped etc. It is suitable for passing through a Gaffer graph, and will form the basis for representation external procedurals in Gaffer. When rendered, it is passed to the renderer as a lightweight Renderer::ExternalProcedural.
Added external procedural support to IECoreRI::Renderer.

ProcDynamicLoad and ProcDelayedReadArchive are supported but there is no support for ProcRunProgram yet. Parameters may be passed to ProcDynamicLoad either from a single ri:data string parameter, or from arbitrary parameters which are serialised automatically into a command line style. This seems a reasonable way of dealing with the "all in one string" limitations of RenderMan procedural parameters, and since Yeti uses a command line style parser, arbitrary parameters should be useable with at least one third party procedural we're interested in.
Made ExternalProcedurals draw as wireframe boxes in IECoreGL::Renderer.
Fixed include order in IECoreGL/Renderer.cpp.
Added support for external procedurals to IECoreArnold::Renderer.