fixed timeout issue

When you get:

ReaderThread:   Waiting, time to die: T-180 seconds
ReaderThread:   Waiting, time to die: T-150 seconds
ReaderThread:   Waiting, time to die: T-120 seconds
ReaderThread:   Socket closed, got 0 bytes!
ReaderThread:   Sending disconnected because of closed

Try this fix, it will send a ping around each 30secs and the issue is solved!
AutoPing is on by default.

Also fixed the executable permission to use the yowsup-cli.