Removed spurious common directories from nw and hmm to centralize a single version of the files
Added global makefile to recursively call make and make clean on all benchmark directories
NW: removed opencl binary executable from repo
DWARF_RUNNER: removed extra blank line
Changed output type of common_randJS from float to double to follow JS native types
Changed implementation type from float to double, fixed matrix multiplication bug in matrix creation and general clean-up
LUD+BACKPROP: Changed usages of Float32Array to Float64Array to follow changes of random number generator from float to double