Tip Component

The tip component is a common wrapper around popover and label. It handles
wiring the two via the anchor interface of popover and toggling the popover
when the label is clicked.
Add phantomjs shims
Fixes warnings in tests regarding templates
Adds hover support to the Tip Component

By passing in 'hover' as the activator, the popover will be triggered
on mouseEnter and mouseLeave rather than click

```hbs
{{#lio-tip activator="hover"}}
...
```