updating the namespace versioning to major_minor and fpe six
Merge branch 'develop' of github.com:openexr/openexr into develop

Conflicts:
	IlmBase/configure.ac
Fix for namespace bug
Changes to namespace versioning to user major_minor suffix
Updating Readme files as well as documentation regarding the use of namespaces in the libraries.
Excluded exr2aces and exrbuild from the build.
Updated the documentation.