* .gitignore: ignored only simplecov.
* coverage/README: Added coverage docs.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47529 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* properties.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47530 b2dd03c8-39d4-4d8f-98ff-823fe69b080e