Merge pull request #28 from zhlwish/master

Support python 2.5 for client
add test for Python 2.5
bump version
bump version
add simplejson
fix travis python env
test with python 2.5 failed
support for python 2.5
support for python 2.5
support for python 2.5
fix test for python 2.5
fix -6 params not work on client. fix IPv6 support
Merge pull request #36 from ZeR0-Wu/master

fix IPv6 support and the '-6' option
bump version
exit quietly when user hits ctrl+C
Merge pull request #41 from everplays/master

exit quietly with KeyboardInterrupt
support IPv6 address
ipv6
Update README.md
Python 2.5 is no longer supported