merge changes back from beta branch

BuildParams

build.sh

doc/contributions.txt

etc/message.xml

indra/cmake/Copy3rdPartyLibs.cmake

indra/cmake/GetPrerequisites_2_8.cmake

indra/cmake/LLAddBuildTest.cmake

indra/llaudio/llaudioengine.cpp

indra/llcommon/llfile.cpp

indra/llcommon/llfile.h

indra/llcommon/llmemory.cpp

indra/llcommon/llmemory.h

indra/llcommon/llmemtype.cpp

indra/llcommon/llversionviewer.h

indra/llimage/llimage.cpp

indra/llimage/llimage.h

indra/llimage/llpngwrapper.cpp

indra/llimage/llpngwrapper.h

indra/llmath/llbbox.cpp

indra/llmath/llbbox.h