correspond to 'x * 4' and 'x / 2 (x>0)'
support external tuple
bug fix
able to compile mandelbrot.ml
modify linker to link arrayLib and floatLib
bug fix
bug fix

get able to compile mandelbrot.ml with closure
set correct $sp and $gp
Merge branch 'master' of https://github.com/cpuex2014-4/compiler