Added mips instructions

Added mips instructions 
Fix it in your pullreq with another commit and i'll squash and cherrypick it when i get at home.

Thanks



> On 28 Jun 2014, at 21:20, zlice <notifications@github.com> wrote:
> 
> In libr/asm/arch/mips/mipsasm.c:
> 
> > @@ -35,6 +35,38 @@ static struct {
> >  	{ "addi", 'I', 3, 8 },
> >  	{ "addiu", 'I', 3, 9 },
> >  	{ "bnez", 'I', 2, 5 },
> > +	{ "bne", 'I', 3, 1 },
> n should = 5 here (1 = 5*)
> 
> —
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