fix(index): image link should use relative path

Some images are using prefix / and it shouldn't as there is already the
<base href> element which is set to /
Then the prefix is changed by using base href element

Closes #117
fix(angularui-bootstrap): close popover/tooltip when clicking on body

This fix hides a shown popover/tooltip if the user clicks away on the
body of the page.
fix(popovers): open and close on click

When the popovers are shown by mousenter, they hide on mouseleave. This
prevents you from entering the actual popover and click on links in the
popped up content.

Closes #119