add coverage
parallel libsodium and socksify builds
fix tests
master should wait for child to quit
add asyncdns test
lint code
remove domain not existed test(causing time out)
fix coverage
add coveralls
remove pypy as it is too slow
remove coveralls
add unit tests in encrypt
only test some ciphers
log method in encrypt unit test
disable M2Crypto on Python 3
try to find the problem
fix key cache when just method changes
small fix
Update CONTRIBUTING.md