hw2.py and chebgr.py
defined python/ncalc
python/hw2 module
Merge branch 'master' of abacus.math.lsa.umich.edu:git/Topics/Math-471
minor fix to python/lgrng
Merge branch 'master' of abacus.math.lsa.umich.edu:git/Topics/Math-471
matlab/cntrd.m and matlab/simpson.m