[git-svn] "@" character in file names

iOS high resolution (retina) images have file name with "@2x" at the end. This "@" character makes command "git svn dcommit" crash with following message:

Assertion failed: (svn_uri_is_canonical(child_uri, NULL)), function uri_skip_ancestor, file /SourceCache/subversion/subversion-62/subversion/subversion/libsvn_subr/dirent_uri.c, line 1519.
error: git-svn died of signal 6

Adding "@" to list of characters fixes this issue.