Added tasks controller, spec, JS, apitesthelper

Had an issue with calling render_views in the specs to render the
jbuilder json templates and also getting the devise sign_in method to
work, ended up adding a helper to add the username/password for a user

app/assets/javascripts/task_lists.js

@@ -0,0 +1,32 @@
+$(".task_list_task").click(function(){
+  $("#update_tasks_submit").removeClass("disabled");
+});
+
+$("#update_tasks_submit").click(function(){
+
+  tasks = [];
+  $(".task_list_task").each(function(){
+    tasks.push({
+      id: parseInt($(this).data("id")),
+      done: $(this).is(":checked")
+    });
+  });
+
+  json_data = { tasks: tasks };
+
+  $.ajax({
+    url: $("#update_tasks_submit").data("url"),
+    type: "PUT",
+    data: JSON.stringify(json_data),
+    contentType: 'application/json',
+    dataType: "json",
+    success: function(data, status, xhr){
+      //should re-render via JS, but for now reload
+      location.reload();
+    },
+    error: function(data, status ){
+      alert("An error occured updating tasks");
+      //displayFormErrors(data.responseJSON);
+    }
+  });
+});