option to add title to <Button>, use for toot buttons (#197)

app/javascript/mastodon/components/__tests__/__snapshots__/button-test.js.snap

@@ -112,3 +112,19 @@ exports[`<Button /> renders the props.text instead of children 1`] = `
   foo
 </button>
 `;
+
+exports[`<Button /> renders title if props.title is given 1`] = `
+<button
+  className="button"
+  disabled={undefined}
+  onClick={[Function]}
+  style={
+    Object {
+      "height": "36px",
+      "lineHeight": "36px",
+      "padding": "0 16px",
+    }
+  }
+  title="foo"
+/>
+`;

app/javascript/mastodon/components/__tests__/button-test.js

@@ -72,4 +72,11 @@ describe('<Button />', () => {
 
     expect(tree).toMatchSnapshot();
   });
+
+  it('renders title if props.title is given', () => {
+    const component = renderer.create(<Button title='foo' />);
+    const tree      = component.toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
 });