add log method
handle prune parameter to log method
touch up log methods
map svn heads to paths and revisions
do away with cleanRev class method
fix signature of SvnRepo.log
change up log method a bit more
change SvnRepo._maprev to return path prefix
fix up SvnRepo._proplist to handle revision properties; create public proplist and propget methods
SvnRepo.propget should take a property parameter
create VCSRepo.ancestor method
add VCSRepo.empty method
add test cases for empty repos
fix HgRepo.tags method when repo is empty
include full commit message in CommitLogEntry
correctly handle empty commit messages
fix bug in SvnRepo.{propget,proplist}
create SvnRepo._mergeinfo method
fix bug in SvnRepo._maprev
strip newline from return of GitRepo.ancestor