fix bugs

fix bug

fix download file bugs

pull in torch7, nn, cunn and cutorch from oss

Summary:
torch7: 14a48d8bec257654fdc85f0be5b2d15d1c626acf
nn: 8a7a318a17903214ff616f5e06af85b10149d16d
cunn: a8a1c775108548a8bc6919a3b975ccbfe4fe1bf0
cutorch: 0133fbc8fbe12e14a98cc34921e7551572e09d5f

Reviewed By: soumith

Differential Revision: D3915667

fbshipit-source-id: 20e51c167c17042bd02107f14b2a23d76ad6b981

stable version 1