fix #145: un-updated README for default value of codeRoot
fix #147: arguments should be optional
fix #144: double comparison problem in C#
update arena
Merge branch 'master' of https://github.com/shivawu/topcoder-greed

Conflicts:
	src/main/java/greed/model/Convert.java
Merge branch 'master' of https://github.com/vexorian/topcoder-greed

Conflicts:
	src/main/java/greed/model/Convert.java