9.0.0-a1

IECore

• Added from-python conversion of RunTimeTypedClass to IECore::TypeId
• Removed implicit surface functionality
• Removed BGEO and BIN readers/writers.
• Removed IFFHairReader.
• Fixed EXRImageReader canRead to accept scanline images.
• Improved speed of InternedString( int64_t ).
• Significantly optimised LRUCache performance.

IECoreMaya

• Fixed MayaScene for reading scene:visible and custom attributes at the root