Changes for version 2.59
- PUREPERL_ONLY support was not supported... and finally remove all PP options from Makefile.PL.
- recommend JSON::XS instead of conditionally requiring it patched by miyagaw ( for example, $ cpanm --with-recommends JSON)
- Hide more packages from PAUSE (and other stuff) patched by miyagawa
- JSON::PP::Boolean - dummy module providing JSON::PP::Boolean