Add '--color=never' to 'ls' command to repress output with escaped strin...

Add '--color=never' to 'ls' command to repress output with escaped string for color terminal.

When I tried to install it on a virtualbox box by vagrant, met an error when I installing gmap:

```bash
[0m[34;42mgmap-2012-11-09/[0m
```

It is caused by the 'ls' command with color terminal output.

So "--color=never" was added to avoid such error.

Environment:
Host: ubuntu desktop 12.04
virtualbox: http://files.vagrantup.com/precise64.box