Add note to contributing file about ruby 1.8.7/rspec 1.3 support
Add note to contributing file about ruby 1.8.7/rspec 1.3 support

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