Revert "[aura:iteration] Changing items cause error to be shown on screen in IE7/8"

This reverts commit bfb40c3d6fe55d28f35c378bd8391351a91c8410.

Revert "aura:iteration and ArrayValue rerender() gen 2"

This reverts commit 44e750351474fc86610d8952b963663fe8b65347.

Conflicts:

	aura-impl/src/main/resources/aura/value/MapValue.js
Merging origin/dchasman/master-pending-revertHaloCompatMods into master