public function store()
 {
     $mitra = new Mitra();
     $mitra->nama = Input::get('nama');
     $mitra->cluster = Input::get('cluster');
     $mitra->pic = Input::get('pic');
     $mitra->hp = Input::get('hp');
     $mitra->no_rekening = Input::get('no_rekening');
     $mitra->nama_rekening = Input::get('nama_rekening');
     $mitra->bank = Input::get('bank');
     $mitra->save();
     Session::flash('success', 'Data berhasil disimpan');
     return Redirect::to('/' . Auth::user()->role . '/mitra');
 }