Correct title of installer with .pkg

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2440 f4f36d40-9719-0410-9868-dde021a23eda
Fix errors on Snow Leopard from missing definition of RFLOAT_VALUE()

header file of ruby built-in Snow Leopard is version 1.8.7-p174.
(libruby is version 1.8.7-p358)
the version does not have RFLOAT_VALUE().

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2441 f4f36d40-9719-0410-9868-dde021a23eda
Fix test test_s_dataWithContentsOfURL error on Snow Leopard

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2442 f4f36d40-9719-0410-9868-dde021a23eda