force-show elements when animating them (override `visibility: hidden` from CSS)

This way it is possible to have

```css
.wow {
  visibility: hidden;
}
```
in your CSS to avoid flashing elements before WOW is loaded.
add tests for the 'visibility' property
prep for 0.1.3
Update README.md
Update README.md
Update README.md
Spacing
Fix outdated copyright year (update to 2014)

The copyright year was out of date. Copyright notices must reflect the current year. This commit updates the listed years to include 2014.

see: http://www.copyright.gov/circs/circ01.pdf for more info
Merge pull request #37 from phillipalexander/fix-copyright

Fix outdated copyright year (update to 2014)
Update LICENSE-MIT
Update demo.html
fix init not working when called during the 'interactive' state (fixes #40)
release 0.1.4

This is a bugfix release that fixes WOW not initialising correctly when
called during the `interactive` document state (e.g. inside jQuery `$()`).
Merge tag '0.1.4' into gh-pages. @matthieua I got some merge conflicts on the demo page, why did you make such funny changes in this branch?

Conflicts:
	README.md
	bower.json
	demo.html
	dist/wow.min.js
	package.json
	src/wow.coffee