I think user may want to load bitmap bigger than texture size. 
(If user use a software rendering, limitation much bigger than hardware rendering) - [Max Bitmap Width : 32766](https://groups.google.com/d/msg/android-developers/UFjDiBUfY78/HUVgfIb4CpwJ)

So I added option(`overTextureSize`) for turning off this down sizing. (Default value is false : use this down sizing)