Removal of the NERD_tree (VIM)
Removed NERD_tree refs
Updating Vim dist script
Block vimscript if below vim 7.0 to control errors when on RHEL4
Only turn on VIM spelling when on verion 6.4 or above, vim 6.3 does not support it
Removed Dead code, cleaned up options, contolled when some options are enabled, perform version checks to keep RHEL4 happy