parse into  json and log error

Modify and execute `parse_version2.rb` shall parse each HTML file from
[laweasyread-data/rawdata/lawstat/version2] into a corresponding JSON.
Multi-byte characters that has no conversion from Big5 to UTF-8 in Ruby
are listed in `lyParser_ruby/json/version2/error.log` with their
belonging files, which aren't parsed.