A new config option called isAppended
A new config option called isAppended

adding new config option called isAppended.
This new option allows the user to decide if he wants new items to appended (the default) or prepended. 
Setting the following will cause packery to use prepended: isAppended="false"
SunGard-Labs/angular-packery,jodytate/angular-packery,gemr/angular-packery