Bump compile and target SDK version to 25 (Nougat)
Bump compile and target SDK version to 25 (Nougat)

Summary: Updated target and compile SDK to Nougat, also updated build tools.

Reviewed By: lambdapioneer

Differential Revision: D4468577

fbshipit-source-id: eb401b4e69febdcf261dff58d491dd2aedc3724c

facebook/fresco,xjy2061/NovaImageLoader,facebook/fresco,MaTriXy/fresco,MaTriXy/fresco,xjy2061/NovaImageLoader,xjy2061/NovaImageLoader,s1rius/fresco,MaTriXy/fresco,s1rius/fresco,desmond1121/fresco,facebook/fresco,desmond1121/fresco,desmond1121/fresco,desmond1121/fresco,facebook/fresco,facebook/fresco,s1rius/fresco,xjy2061/NovaImageLoader,facebook/fresco,s1rius/fresco,xjy2061/NovaImageLoader,MaTriXy/fresco,desmond1121/fresco,MaTriXy/fresco