Test with ruby 2.2.0 in Travis
Test with ruby 2.2.0 in Travis

Also update ruby 2.1 to latest release.

nju520/sequel,nicohvi/sequel,davidbegin/sequel,t-morgan/sequel,reubano/sequel,Marketcircle/sequel,davidbegin/sequel,gferguson-gd/sequel,nju520/sequel,pfarrell/sequel,mpalmer/sequel,pfarrell/sequel,offshore-safety/sequel,mpalmer/sequel,uhoh-itsmaciek/sequel,offshore-safety/sequel,beni55/sequel,offshore-safety/sequel,knut2/sequel,reubano/sequel,beni55/sequel,knut2/sequel,gferguson-gd/sequel,uhoh-itsmaciek/sequel,yazshel/sequel,seeARMS/sequel,seeARMS/sequel,yazshel/sequel,nicohvi/sequel,t-morgan/sequel