Suppress warnings -Wcast-of-sel-type

- use sel_getName() at 'SEL' to 'const char *'

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2423 f4f36d40-9719-0410-9868-dde021a23eda
Fix indent

git-svn-id: https://svn.code.sf.net/p/rubycocoa/svn/trunk/src@2424 f4f36d40-9719-0410-9868-dde021a23eda