Allow to run `clean` task witout "config.save" file

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2534 f4f36d40-9719-0410-9868-dde021a23eda
Expand tabs to space in code examples

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2535 f4f36d40-9719-0410-9868-dde021a23eda
Add framework/.yardoc to gitignore

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2536 f4f36d40-9719-0410-9868-dde021a23eda
Update NEWS

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2537 f4f36d40-9719-0410-9868-dde021a23eda
Update documents for OSX.ns_import, OSX.objc_classnames, OSX::NSPoint and OSX::NSSize

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2538 f4f36d40-9719-0410-9868-dde021a23eda