* lib/pstore.rb (commit_new): use FileUtils.copy_stream for Cygwin.
  [ruby-dev:23157]

* lib/pstore.rb (transaction): allow overriding dump and load.
  [ruby-dev:23567]

* lib/pstore.rb (PStore#transaction): get rid of opening in write mode
  when read only transaction.  [ruby-dev:23842]

* lib/yaml/store.rb: follow lib/pstore.rb's change.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8@6562 b2dd03c8-39d4-4d8f-98ff-823fe69b080e