add NAS Conjugate Gradient benchmark
fix profile worker bug
fix np.add, np.multiply, ... can not work for a sparse and a dense
matrix bug
add np.linalg.norm function into buildins
Merge branch 'master' of github.com:spartan-array/spartan

Conflicts:
	spartan/expr/builtins.py
add mahout naive bayes classification app
fix format
Merge pull request #109 from MaggieQi/master

add NAS Conjugate Gradient benchmark and naive bayes