* lib/net/http.rb: remove unused class Accumulator.
* lib/net/http.rb: read response in HTTP#request. not HTTPRequest#exec.
* lib/net/http.rb: proxy related class instance variables are not initialized correctly.
* doc/net/http.rb: modify typo in the description of basic auth.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_6@2100 b2dd03c8-39d4-4d8f-98ff-823fe69b080e