Fix IE 10 active link background color

Remove the gray background color from active links in IE 10.

Fix gh-172
Normalize the `template` element display

The `template` element shipped in Firefox 22 and Chrome 26. Browsers
without HTML template support should at least hide the element.
README: change guidance and demphasise v1

* Recommend that normalize.css is used as library code (i.e., not
  modified).

* Add a note that v1 is no longer actively developed.
Add Component(1) install instructions
Fix incorrect closing tag in `test.html`
Add IE 10 to checkbox/radio normalization comments
Fix component.json

The Component(1) spec was updated to require a `repo` property.
Update CHANGELOG
v2.1.3