Accordion groups broken in v0.7.0

[pierregm]

As described in this thread, it is no longer possible to have accordion groups generated by a ng-repeat open independently in v0.7.0, when it worked in v0.6.0.
This plunker illustrates the issue.

On the same thread, @petebacondarwin provided a fix.

[bekos]

@pierregm You are right about this.

@petebacondarwin Are you going to fix this or master or shall I try? Thx anyway :-)

[petebacondarwin]

@bekos - feel free!

[petebacondarwin]

Nice one @bekos