[Feature request] Add offset parameter to AnchorScroll

[CoenWarmer]

It would be really helpful if the anchorScroll function would allow a variable that sets an offset from an element. For instance:

$location.hash(id); $ionicScrollDelegate.anchorScroll('40');

This would make ion-scroll scroll 40 pixels past the position of the id element.

Could also be negative, or maybe even two variables, one for x, one for y?

[ajoslin]

Added via scrollBy in #987!

[ionitron-bot]

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