fix lint errors

Summary:
Changelog: [Internal][Yoga] Fixed lint errors

```arc lint --apply-patches --take CLANGFORMAT --paths-cmd 'hg files xplat/yoga'
```
Added .clang-tidy file

Reviewed By: zertosh

Differential Revision: D19948702

fbshipit-source-id: f77a16d6f2c532267597a84a9caded0aae68c3aa

java/jni/ScopedGlobalRef.h

@@ -84,9 +84,7 @@ public:
     return *this;
   }
 
-  ~ScopedGlobalRef() {
-    reset();
-  }
+  ~ScopedGlobalRef() { reset(); }
 
   /**
    * Deletes the currently held reference and reassigns a new one to the
@@ -120,9 +118,7 @@ public:
   /**
    * Returns true if the underlying JNI reference is not NULL.
    */
-  operator bool() const {
-    return mGlobalRef != NULL;
-  }
+  operator bool() const { return mGlobalRef != NULL; }
 
   ScopedGlobalRef(const ScopedGlobalRef& ref) = delete;
   ScopedGlobalRef& operator=(const ScopedGlobalRef& other) = delete;