[React Native] Remove layout-only nodes

Summary:
Remove layout-only views. Works by checking properties against a list of known properties that only affect layout. The `RCTShadowView` hierarchy still has a 1:1 correlation with the JS nodes.

This works by adjusting the tags and indices in `manageChildren`. For example, if JS told us to insert tag 1 at index 0 and tag 1 is layout-only with children whose tags are 2 and 3, we adjust it so we insert tags 2 and 3 at indices 0 and 1. This keeps changes out of `RCTView` and `RCTScrollView`. In order to simplify this logic, view moves are now processed as view removals followed by additions. A move from index 0 to 1 is recorded as a removal of view at indices 0 and 1 and an insertion of tags 1 and 2 at indices 0 and 1. Of course, the remaining indices have to be offset to take account for this.

The `collapsible` attribute is a bit of a hack to force `RCTScrollView` to always have one child. This was easier than rethinking out the logic there, but we could change this later.

@public

Test Plan: There are tests in `RCTUIManagerTests.m` that test the tag- and index-manipulation logic works. There are various scenarios including add-only, remove-only, and move. In addition, two scenario tests verify that the optimization works by checking the number of views and shadow views after various situations happen.

Libraries/Components/ScrollView/ScrollView.js

@@ -279,6 +279,7 @@ var ScrollView = React.createClass({
 
     var contentContainer =
       <View
+        collapsible={false}
         ref={INNERVIEW}
         style={contentContainerStyle}
         removeClippedSubviews={this.props.removeClippedSubviews}>

Libraries/Components/View/View.js

@@ -77,6 +77,12 @@ var View = React.createClass({
   },
 
   propTypes: {
+    /**
+     * When false, indicates that the view should not be collapsed, even if it is
+     * layout-only. Defaults to true.
+     */
+    collapsible: PropTypes.bool,
+
     /**
      * When true, indicates that the view is an accessibility element. By default,
      * all the touchable elements are accessible.