[Examples] Move several simpler, single-purpose examples to extras to ensure Travis does not time out.

examples_extra/ASTraitCollection/Sample/OverrideViewController.h

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+/* This file provided by Facebook is for non-commercial testing and evaluation
+ * purposes only.  Facebook reserves all rights not expressly granted.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * FACEBOOK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+/*
+ * A simple node that displays the attribution for the kitties in the app. Note that
+ * for a regular horizontal size class it does something stupid and sets the font size to 100.
+ * It's VC, OverrideViewController, will have its display traits overridden such that
+ * it will always have a compact horizontal size class.
+ */
+@interface OverrideNode : ASDisplayNode
+@end
+
+/*
+ * This is a fairly stupid VC that's main purpose is to show how to override ASDisplayTraits.
+ * Take a look at `defaultImageTappedAction` in KittenNode to see how this is accomplished.
+ */
+@interface OverrideViewController : ASViewController<OverrideNode *>
+@property (nonatomic, copy) dispatch_block_t closeBlock;
+@end