Fix #212

[haxpor]

I branched out from my forked repository, and manually tested it. It works fine and can provide normal <a> functionality to link to normal URL, or react-router's URL.

We can use the following code in Grid's Data.

const data = [
  {
    icon: <img src={issue_icon} alt="issue icon"/>,
    label: 'Issues ...',
    to: '/issues'
  },
  {
    icon: <img src={project_icon} alt="project icon"/>,
    label: 'Projects',
    to: '/projects'
  },
  {
    icon: <img src={contribute_icon} alt="contribute icon"/>,
    label: 'Contributes',
    href: 'https://google.com'
  }
];

The first two items are for react-router's URL, and the third one is for normal URL. When click, it takes to destination properly.

Anyway, the code seems easy and straightforward but not sure it should be the approach use or not as it directly use react-router's <Link> and I checked react-weui already depends on it although older version.

[coveralls]

Coverage decreased (-6.5%) to 82.097% when pulling d38636c on haxpor:fix_#212 into ace7de6 on weui:master.

[haxpor]

closed due to branch management, and duplicated in #213