builder: handle anything we cannot parse the command for as a fatal error

@LK4D4 @tiborvass 
ha, thanks.

On Oct 14, 2014, at 8:44 PM, Tibor Vass <notifications@github.com> wrote:

> In builder/parser/utils.go:
> 
> >  	cmdline := TOKEN_WHITESPACE.Split(line, 2)
> > +
> > +	if len(cmdline) != 2 {
> > +		return "", "", fmt.Errorf("We do not understand this file. Please ensure is it a valid Dockerfile.")
> ensure it is.
> 
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