from StringIO of Tempfile when multipart parse without file field.
add files method that can uploaded files. [ruby-dev:36547]
* test/cgi/test_cgi_multipart.rb: fix the test for core.rb.
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and replace like as 1.8's in multipart reading.
see [ruby-dev:36443],
reference from CGIAlt http://cgialt.rubyforge.org/
* test/cgi/test_cgi_multipart.rb : fixed multipart test.
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accept parameters either in a hash,
string as a block. add the encoding validation process.
* test/cgi/test_cgi_core.rb : test for query encoding check.
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