Update Net:HTTP and URI for 2.0 library
Update CGI from Ruby 2.0
Update minitest with 2.0
Update ReXML for 2.0
Update Matrix for 2.0
Update Observer for 2.0
Update optparse for 2.0
Update Monitor from 2.0
Update mutex_m from 2.0
Update pretty printers for 2.0
Update prime for 2.0
Add missing file for optparse
Update RSS for 2.0
Update webrick for 2.0
Update XML RPC for 2.0
Update IPAddr for 2.0
Add rinda from 2.0
Update ERB from 2.0
Update CSV from 2.0
Update DRB from 2.0