Collection<T>.post_to_wall: use RTValue post_to_wall when available
Collection<T>.post_to_wall: use RTValue post_to_wall when available

sedouard/TouchDevelop,MetSystem/TouchDevelop,jle33/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,MetSystem/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,jmptrader/TouchDevelop,ntoll/TouchDevelop,jle33/TouchDevelop,Aksoom-Hussain/TouchDevelop,Aksoom-Hussain/TouchDevelop,ntoll/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,CodeKingdomsTeam/TouchDevelop,UIKit0/TouchDevelop,CodeKingdomsTeam/TouchDevelop,sedouard/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,jle33/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,sedouard/TouchDevelop,UIKit0/TouchDevelop,Aksoom-Hussain/TouchDevelop,jmptrader/TouchDevelop,ntoll/TouchDevelop,imadityab/FSE-2012-TouchDevelop-old,imadityab/FSE-2012-TouchDevelop-old,UIKit0/TouchDevelop,jmptrader/TouchDevelop,MetSystem/TouchDevelop,jle33/TouchDevelop,jmptrader/TouchDevelop,jle33/TouchDevelop,SoftwareEngineeringToolDemos/FSE-2012-TouchDevelop,CodeKingdomsTeam/TouchDevelop,CodeKingdomsTeam/TouchDevelop