Fix sizing of non strech items

Summary:
Fixes the sizing of items so that under most scenarios it calcultes its height by it's content for non exact measurings. This introduces a new useLegacyStretchBehaviour flag on the config to opt out of this change as it is breaking.

See facebook/yoga#505
Closes https://github.com/facebook/yoga/pull/506

Reviewed By: astreet

Differential Revision: D4954016

Pulled By: emilsjolander

fbshipit-source-id: d28bd5d174cd76951fb94df85e3b0cfab7f81ff7

java/com/facebook/yoga/YogaExperimentalFeature.java

@@ -13,8 +13,7 @@ import com.facebook.proguard.annotations.DoNotStrip;
 
 @DoNotStrip
 public enum YogaExperimentalFeature {
-  WEB_FLEX_BASIS(0),
-  MIN_FLEX_FIX(1);
+  WEB_FLEX_BASIS(0);
 
   private int mIntValue;
 
@@ -29,7 +28,6 @@ public enum YogaExperimentalFeature {
   public static YogaExperimentalFeature fromInt(int value) {
     switch (value) {
       case 0: return WEB_FLEX_BASIS;
-      case 1: return MIN_FLEX_FIX;
       default: throw new IllegalArgumentException("Unknown enum value: " + value);
     }
   }