settings: define [b and ]b in vimrc


git-svn-id: https://subversion.assembla.com/svn/magicant/settings@314 9a5e03f8-c55e-0410-a490-9d27d325e308
settings: use execcommandrange for [b and ]b in vimrc


git-svn-id: https://subversion.assembla.com/svn/magicant/settings@315 9a5e03f8-c55e-0410-a490-9d27d325e308