Use “smart quotes”
[MAJOR] Partial rewrite of a couple of files.
Merge branch 'master' of github.com:wei2912/bce-simulation

Conflicts:
	all.py
	coin.py
	coin_phy.py
	needle.py
	utils/coin.py
	utils/coin_phy.py
	utils/coin_phy_test.py
	utils/coin_test.py
	utils/graph.py
	utils/misc.py
	utils/needle.py
	utils/needle_test.py