Executable bit on some files

This does not affect code working but ugly and confuses shell users.
Executable permission bit is set for some files which are not expected to be run.

$ find acti* rail* -type f -perm /111 -exec ls -F '{}' +
actionpack-3.0.0.beta4/lib/action_dispatch/http/request.rb*
activerecord-3.0.0.beta4/examples/performance.rb*
activerecord-3.0.0.beta4/lib/active_record/associations.rb*
activerecord-3.0.0.beta4/lib/active_record/base.rb*
activerecord-3.0.0.beta4/lib/active_record/connection_adapters/abstract_adapter.rb*
activesupport-3.0.0.beta4/lib/active_support/core_ext/object/to_param.rb*
[This is OK->] rails-3.0.0.beta4/bin/rails*
railties-3.0.0.beta4/guides/assets/javascripts/code_highlighter.js*
railties-3.0.0.beta4/guides/assets/javascripts/guides.js*
railties-3.0.0.beta4/guides/assets/stylesheets/print.css*
railties-3.0.0.beta4/guides/assets/stylesheets/reset.css*
railties-3.0.0.beta4/guides/assets/stylesheets/style.css*
railties-3.0.0.beta4/lib/rails/commands/generate.rb*
railties-3.0.0.beta4/lib/rails/generators/rails/app/templates/Rakefile*