Remove most .DS_Store files.
The Finder of Mac OS X tends to create and modify these files whenever
it gets a chance. Put .DS_Store in .git/info/exclude, and remove the
existing files so "git status" won't say that they have been modified.
(I'm not creating .gitignore files for these, because nothing in the
build system generates .DS_Store files.)
Leave Sparkle.framework/Versions/A/Resources/.DS_Store intact though,
so as to keep the Sparkle.framework directory identical to what is in
Sparkle-1.1.zip.