Implement platform-specific .abignore files

Implement platform-specific .abignore files

Refs http://teampulse.telerik.com/view#item/281060
You are doing the same operation in the if and else bodies: pushing it to an array. It is best to extract just the configuration name getting in an if or ternary and then push it to the array outside of the conditional. This way you will eliminate the duplicate string concatenation.