first commit
added use of native_transendentals, need to add IR
added support for native and double precision trigonometry/transendentals
added support for double precision/native transendentals/trigonometry
fix for knc.h. Due to a bug in ICC (tested with 13.1.3 & 14.0.1) ,the resulting .cpp file fails to compile
added double precision tests
accuracy fix
Merge pull request #736 from egaburov/native_trigonometry

Native trigonometry
merged with master