use global variable for Redis instance instead (support Ruby 2.0)
use global variable for Redis instance instead (support Ruby 2.0)

g0v/Logbot,pcchou/Logbot,g0v/Logbot,BirkhoffLee/Logbot,ysitd/Logbot,pcchou/Logbot,ysitd/Logbot,BirkhoffLee/Logbot,BirkhoffLee/Logbot,ysitd/Logbot,g0v/Logbot,BirkhoffLee/Logbot,ysitd/Logbot,pcchou/Logbot,g0v/Logbot,pcchou/Logbot