fix indentation & add docs

Author: jacob-tabak

library/src/main/java/com/timehop/stickyheadersrecyclerview/StickyRecyclerHeadersTouchListener.java

@@ -17,7 +17,7 @@ public interface OnHeaderClickListener {
   }
 
   public StickyRecyclerHeadersTouchListener(final RecyclerView recyclerView,
-      final StickyRecyclerHeadersDecoration decor) {
+                                            final StickyRecyclerHeadersDecoration decor) {
     mTapDetector = new GestureDetector(recyclerView.getContext(), new SingleTapDetector());
     mRecyclerView = recyclerView;
     mDecor = decor;
@@ -40,17 +40,18 @@ public void setOnHeaderClickListener(OnHeaderClickListener listener) {
 
   @Override
   public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
-        if (this.mOnHeaderClickListener != null) {
-            boolean tapDetectorResponse = this.mTapDetector.onTouchEvent(e);
-            if (tapDetectorResponse) {
-                return true;
-            }
-            if (e.getAction() == MotionEvent.ACTION_DOWN) {
-                int position = mDecor.findHeaderPositionUnder((int)e.getX(), (int)e.getY());
-                return position != -1;
-            }
-        }
-        return false;
+    if (this.mOnHeaderClickListener != null) {
+      boolean tapDetectorResponse = this.mTapDetector.onTouchEvent(e);
+      if (tapDetectorResponse) {
+        // Don't return false if a single tap is detected
+        return true;
+      }
+      if (e.getAction() == MotionEvent.ACTION_DOWN) {
+        int position = mDecor.findHeaderPositionUnder((int)e.getX(), (int)e.getY());
+        return position != -1;
+      }
+    }
+    return false;
   }
 
   @Override