Nix developement environment config script

- Assumes two env vars exist:
  $WEBKIT -> Root dir of webkit-nix project (not the source)

- Execute it from .bashrc, for example:

    WEBKIT=$HOME/projects/webkit-nix
    if [ -f $WEBKIT/nix-env.sh ]; then
        export WEBKIT
        . $WEBKIT/nix-env.sh
    fi

- Nix github repository added as submodule

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>
Add some alias to nix-env script

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>
tmp
New changes in nix-env script

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>
Adding some new files

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>
Update nix-env script and clean some useless files up

Signed-off-by: Nick Diego Yamane <nick.yamane@openbossa.org>