Fix handling anchors with nested elements

If an anchor contains nested elements (e.g. a span), onAnchorClick did
not handle the events that start on the nested elements.
Update min-files, bump version to 4.0.6

Minified from previous commit 27d79fb08833fe376fcdced3f9e7789a23e9415e
Merge pull request #37 from sompylasar/master

Fix handling anchors with nested elements