Add backend support to glog
Write all logs to os.Stdout.  Remove unnecessary code.

Also, remove the PID (due to being useless)

R=dbapat
Add glog as the io.Writer for default log r=robfig
glog: add ErrorIf/WarningIf
glog: glog now has a separate external output r=robfig
glog: add FatalIf
glog: Use stack trace (details) of errgo if error
Merge pull request #1 from yext/master

merge