Log Message:
Updating converters/p5-JSON-XS 2.27 to 2.28

Upstream changes:
2.28  Thu Mar 11 20:30:46 CET 2010
	- implement our own atof function - perl's can be orders of
          magnitudes slower than even the system one. on the positive
          side, ours seems to be more exact in general than perl's.
          (testcase provided by Tim Meadowcroft).
        - clarify floating point conversion issues a bit.
	- update jpsykes csrf article url.
        - updated benchmark section - JSON::PP became much faster!