Merge pull request #55 from paperlesspost/fix_background_ping

Potential fix for background ping #54

After a couple of days in production, this seemed to do the trick
Fix for #54
Swapped a few Print/Println statements with Fatalf, which is
equivalent to Printf() followed by a call to os.Exit(1).
Merge pull request #57 from hectcastro/hc-error-logging

Swapped Print/Println statements with Fatalf in example code
Merge pull request #56 from jjmalina/master

Fix for #54
Merge branch 'master' of git://github.com/mrb/riakpbc