Update 2012-09-30-simple-async-programing-with-task.md

test gfm with c# code
revert gfm change
Merge remote-tracking branch 'refs/remotes/origin/draft'
fix a simple error
change header to h2
rename to html
nuget custom package repository location
senior programer good habits
system.net.http for silverlight
Merge branch 'origin/draft'
Merge branch 'origin/draft'