Fix bug: if obfs random method parameter padlen set to 0, connection will fail
Revert "Fix bug: if obfs random method parameter padlen set to 0, connection will fail"

This reverts commit 2a9c9020ee43f31d4863e25cffd2756bb40a66ee.
Fix bug: if obfs random method parameter padlen set to 0, connection will fail.
Add staging code for UDP support
Testing new select() code
Use new select() codes, this will bring better performance
Staging code for UDP support, it does not work right now
UDP tunneling code finished, but without traffic obfuscation
Fix bug: The max number of fd may be set wrong while rebuilding fd_set, this may cause connection break on every UDP session timeout checking period
Add UDP protocol support, use -u parameter to specify UDP tunneling
Merge branch 'master' of https://github.com/greensea/obfstunnel