Grid template preview

New template preview for content section
Update build.bat to beta2
Remove ace from bower and directives folder
A few small tweaks to the C# part of the Grid editor for coding standards
Merge pull request #531 from Jeavon/GridCodeStandards

A few small tweaks to the C# part of the Grid editor for coding standard...
Fixes: U4-5780 RenderActionInvoker needs a perf fix with caching when it's using reflection
Merge pull request #528 from robertjf/7.2.0

Fixes issue U4-5754 Attempt to set start node on Media Picker sends user...
removes other refs to $scope.cfg, this is never necessary