dropped support python 2.5 and 3.1 on travis ci
dropped support python 2.5 and 3.1 on travis ci

https://github.com/bottlepy/bottle/commit/901f04962b19e5bd009c38d0716d5f65e4ebf323
ifduyue/bottle,ifduyue/bottle,defnull/bottle,SmithSamuelM/bottle,taisa007/bottle-ja,Inndy/bottle,hkmshb/bottle,SmithSamuelM/bottle,bottlepy/bottle,oz123/bottle,catroot/bottle,catroot/bottle,fkazimierczak/bottle,taisa007/bottle-ja,bottlepy/bottle,defnull/bottle,hkmshb/bottle,fkazimierczak/bottle,Inndy/bottle,oz123/bottle