Fix the Exec'ing processes example
Check in HTML assets
Use runtime.Gosched() instead of time.Sleep

Its not clear for newbies that using `time.Sleep` internally calls  `runtime.Gosched()`

Its better to use it directly, moreover on my machine it shows x175 improvement in speed (7m requests per second vs 40k).
Merge remote-tracking branch 'buger/patch-1'
explain gosched
rebuild
Merge remote-tracking branch 'jingweno/master'
update comment
rebuild