Expanded test script's test cases

Updated Test Script to include links with link target attributes (e.g.
_blank, _self). This is to test a fix so if a link target is specified,
the link opens in target location.  Test page also has a title of "File
Not Found" to test 404 evaluation.
Addresses Issue #6, link opens in target

This fix evaluates the target attribute, if it exists, the link opens in
target. If there's no target attribute, the link opens in page
(equivalent of _self).
https://github.com/ignatiushsu/google-analytics-plugin/issues/6