fix the localdirectory and remote_url from svn externals
add git svn-clone and svn-update script, it used for clone and update from
subversion server
fix update repository from other directory not only top
add install doc
fix prameter of clone, and binding svn repository to local repository
fix git config command for bingding svn repository
fix readme  add other local available directory
conside there no externals
choose the local default root name from repository