Revert "trick on UIImageView + AFNetworking"

This reverts commit 5f41f6dd12490307d3a7bada1038ec507c5b4009.
Revert "fix a stupid issue"

This reverts commit 3045bad6de1b4861f14d2e11bf850de9bd01c3d6.
Revert "send image message using image url string"

This reverts commit 477c753010963e3c1d3cc61559b8002f8e697a46.