Suppress warnings 

suppressing warnings in boss/simd unit tests
mainly unused typedefs and some unused var in cpp unit

three hpp files have also been modifyied to fit clang 3.5 in using integral_constant

boost.simd.unit has been compiled using  -mfpmath=sse -Wextra -Wall -Wshadow -std=c++11
and -msse4.2 with clang 3.5 g++4.7 and g++4.9