#1518 declare custom attributes against SimpleDraweeView
#1518 declare custom attributes against SimpleDraweeView

Summary:
Related to #1518

Declare custom attributes against `SimpleDraweeView`to make auto-complete works.

Checked in AndroidStudio 2.3.1
<img width="405" alt="screen shot 2017-04-19 at 21 53 07" src="https://cloud.githubusercontent.com/assets/4812960/25197268/28536cea-254c-11e7-857d-8846e3b8b981.png">
Closes https://github.com/facebook/fresco/pull/1729

Reviewed By: oprisnik

Differential Revision: D5423468

Pulled By: kirwan

fbshipit-source-id: 063a4786c52c0255ad60b2d212e98c40fc618193

MaTriXy/fresco,MaTriXy/fresco,facebook/fresco,xjy2061/NovaImageLoader,MaTriXy/fresco,MaTriXy/fresco,xjy2061/NovaImageLoader,xjy2061/NovaImageLoader,s1rius/fresco,xjy2061/NovaImageLoader,MaTriXy/fresco,facebook/fresco,facebook/fresco,s1rius/fresco,facebook/fresco,xjy2061/NovaImageLoader,facebook/fresco,s1rius/fresco,facebook/fresco,s1rius/fresco