Update svn ignore rules

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1820 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Also clean .o files

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@1821 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5