git config to use xcode file compare for mergetool

.gitconfig

[merge]
        tool = opendiff
[core]
        quotepath = false
        excludesfile = /Users/jray/.gitignore
        whitespace=nowarn

[credential]
        helper = osxkeychain
[difftool "sourcetree"]
        cmd = opendiff \"$LOCAL\" \"$REMOTE\"
        path =
[mergetool "sourcetree"]
        cmd = /Applications/SourceTree.app/Contents/Resources/opendiff-w.sh \"$LOCAL\" \"$REMOTE\" -ancestor \"$BASE\" -merge \"$MERGED\"
        trustExitCode = true