To add a 'results only' toggle button to your IPython notebook, add the snippet below to the file ~/.ipython/profile_default/static/custom/custom.js

results-only.js

$('#menus .navbar-collapse').append($("<button id='results' class='btn btn-default navbar-btn' onclick='exec_code()'>Results Only</button>"));
function exec_code(){      
    $('#results').text(function(i, text){
      return text === "Results Only" ? "Show All" : "Results Only";
    })
    $('.code_cell .input').toggle();
    $('.code_cell .output .output_stderr').toggle();
}