Add all supported twisted version, revise build dependencies
Add all supported twisted version, revise build dependencies

Include all Twisted versions >= 12.2 and latest as travis ENV tests
Add required build dependencies packages
Remove duplicate pip package pydnet (pydumpnet)

0xPoly/ooni-probe,0xPoly/ooni-probe,0xPoly/ooni-probe,0xPoly/ooni-probe