Remote executable bit from ImageLoader

This shouldn't have been executable.

Change-Id: Ib5c23ed853a99a4db55f1f2605528f4d9717ad24
Merge "Remote executable bit from ImageLoader"
Merge branch 'master' of https://android.googlesource.com/platform/frameworks/volley into origin_lu
Merge branch 'origin' of https://github.com/levelup/Volley into http_case