Merge pull request #346 from UnityTech/fix_emoji

Reduce emoji resource size.

Tests/Resources/Emoji.png.meta

   serializedVersion: 10
   mipmaps:
     mipMapMode: 0
-    enableMipMap: 1
+    enableMipMap: 0
     sRGBTexture: 1
     linearTexture: 0
     fadeOut: 0
     wrapU: -1
     wrapV: -1
     wrapW: -1
-  nPOTScale: 0
+  nPOTScale: 1
   lightmap: 0
   compressionQuality: 50
   spriteMode: 0