uibModalTransclude is not animatable

[cleavera]

Description:

Within the modal, the uibModalTransclusion directive does not trigger ng-enter and ng-enter-active classes when the modal is appended. This is because in the transclusion function it calls

element.append(clone);

If this is replaced with

$animate.enter(clone, element);

Then it will trigger the animation cycle and allow them to be hooked into.

Version of Angular, UIBS, and Bootstrap

Angular: Any

UIBS: 1.3.3

Bootstrap: Any

[wesleycho]

Up for filing a PR?