made sure that we stay on active "slide" when elements are added to the head of the watched collection

[kaililleby]

While adding elements to the tail of the watched collection works fine, adding to the head has the undesired effect of also changing the active slide (since the element pointed to by the index changes when we add to the head of the collection). This commit compensates for this - BUT - not knowing all the details of the carousel implmentation - there might be corner cases im not aware of..
Any thoughts?

[revolunet]

Thanks, great fix, looks good to me :)

[revolunet]

in fact this is based on a quite old version so i merged it manually, thanks

[revolunet]

thanks, i implemented this on the new version : 6ff425d

this is a bit more complicated because the $watchCollection simply don't work correctly angular/angular.js#2621 i didnt find a better way