Add XML chars to 'reason' in XmlReporter test

This test modification verifies that the XML-encoding of attributes in
`XmlReporter` is working, since without that, the test would fail (due
to problems parsing out attributes containing quotes).

Change-Id: I839a06d242ff406551699f6dc582da4b90e74097
Reviewed-on: http://gerrit.causes.com/37217
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>
Update README to use double-quotes in XML example

This matches the updates to the XML reporter, since Ruby uses
double-quotes for its XML-attribute string-encodings.

Change-Id: If7d3925a762861e998152fff801c8d9bec5f90cd
Reviewed-on: http://gerrit.causes.com/37216
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>