In #1454, we welcomed a newly-revamped JUnit formatter which has
a dependency on Nokogiri. Unfortunately, this had led us to problems
getting InSpec included in Chef omnibus builds (see chef/chef#5937)
because Chef is using Ruby 2.4.1 and the Nokogiri maintainers have
not yet released a windows binary gem that supports Ruby 2.4.x.
This has led to breaking builds in Chef's CI platform and would
block the acceptance of chef/chef#5937.
This change replaces Nokogiri use with REXML instead. While REXML
can be slower than Nokogiri, it does not require native extensions
and is supported on all Chef platforms.
Signed-off-by: Adam Leff <adam@leff.co>
