July 14,2013 
 	Start everything. Finish register part with tutorial. 
July 15,2013
	sign-in page
July 17,2013 
	Sign-in, Sign-out, update profile, authentication control and admin delete 
2013.7.19 
	Update rails to 2.0.0. It is very weird since the tutorial suddently goes from 2nd to 3rd. The integration_test still fails and don't know why. Lucky, compose microposts works well.