Installation command for openCL packages

[jonathanpeterwu]

Ran into an install error using the following commands for cltorch, clnn.

The github repo recommends using the non luarocks installation method:

Please do NOT use any of: luarocks install nn, luarocks install torch, luarocks install cltorch, luarocks install clnn, luarocks install cutorch, or luarocks install cunn. This will break your installation, and is not supported. The supported update method is:

git clone --recursive https://github.com/hughperkins/distro -b distro-cl ~/torch-cl
cd ~/torch-cl
bash install-deps
./install.sh

Update packages using these commands

cd ~/torch-cl
git pull
git submodule update --init --recursive
./install.sh